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1
Zhou, Weidong, Zhimei Zhao, T. S. Lee, and S. H. Winoto. "Investigation of Flow Through Centrifugal Pump Impellers Using Computational Fluid Dynamics." International Journal of Rotating Machinery 9, no. 1 (2003): 49–61. http://dx.doi.org/10.1155/s1023621x0300006x.
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With the aid of computational fluid dynamics, the complex internal flows in water pump impellers can be well predicted, thus facilitating the design of pumps. This article describes the three-dimensional simulation of internal flow in three different types of centrifugal pumps (one pump has four straight blades and the other two have six twisted blades). A commercial three-dimensional Navier-Stokes code called CFX, with a standardk–εtwo-equation turbulence model was used to simulate the problem under examination. In the calculation, the finite-volume method and an unstructured grid system were used for the solution procedure of the discretized governing equations for this problem.Comparison of computational results for various types of pumps showed good agreement for the twisted-blade pumps. However, for the straight-blade pump, the computational results were somewhat different from widely published experimental results. It was found that the predicted results relating to twisted-blade pumps were better than those relating to the straight-blade pump, which suggests that the efficiency of a twisted-blade pump will be greater than that of a straight-blade pump. The calculation also predicts reasonable results in both the flow pattern and the pressure distribution.
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Gao, J., R. T. Mathias, I. S. Cohen, and G. J. Baldo. "Two functionally different Na/K pumps in cardiac ventricular myocytes." Journal of General Physiology 106, no. 5 (November 1, 1995): 995–1030. http://dx.doi.org/10.1085/jgp.106.5.995.
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The whole-cell patch-clamp technique was used to voltage clamp acutely isolated myocytes at -60 mV and study effects of ionic environment on Na/K pump activity. In quiescent guinea pig myocytes, normal intracellular Na+ is approximately 6 mM, which gives a total pump current of 0.25 +/- 0.09 pA/pF, and an inward background sodium current of 0.75 +/- 0.26 pA/pF. The average capacitance of a cell is 189 +/- 61 pF. Our main conclusion is the total Na/K pump current comprises currents from two different types of pumps, whose functional responses to the extracellular environment are different. Pump current was reversibly blocked with two affinities by extracellular dihydro-ouabain (DHO). We determined dissociation constants of 72 microM for low affinity (type-1) pumps and 0.75 microM for high affinity (type-h) pumps. These dissociation constants did not detectably change with two intracellular Na+ concentrations, one saturating and one near half-saturating, and with two extracellular K+ concentrations of 4.6 and 1.0 mM. Ion effects on type-h pumps were therefore measured using 5 microM DHO and on total pump current using 1 mM DHO. Extracellular K+ half-maximally activated the type-h pumps at 0.4 mM and the type-1 at 3.7 mM. Extracellular H+ blocked the type-1 pumps with half-maximal blockade at a pH of 7.71 whereas the type-h pumps were insensitive to extracellular pH. Both types of pumps responded similarly to changes in intracellular-Na+, with 9.6 mM causing half-maximal activation. Neither changes in intracellular pH between 6.0 and 7.2, nor concentrations of intracellular K+ of 140 mM or below, had any effect on either type of pump. The lack of any effect of intracellular K+ suggests the dissociation constants are in the molar range so this step in the pump cycle is not rate limiting under normal physiological conditions. Changes in intracellular-Na+ did not affect the half-maximal activation by extracellular K+, and vice versa. We found DHO-blockade of Na/K pump current in canine ventricular myocytes also occurred with two affinities, which are very similar to those from guinea pig myocytes or rat ventricular myocytes. In contrast, isolated canine Purkinje myocytes have predominantly the type-h pumps, insofar as DHO-blockade and extracellular K+ activation are much closer to our type-h results than type-1. These observations suggest for mammalian ventricular myocytes: (a) the presence of two types of Na/K pumps may be a general property. (b) Normal physiological variations in extracellular pH and K+ are important determinants of Na/K pump current. (c) Normal physiological variations in the intracellular environment affect Na/K pump current primarily via the Na+ concentration. Lastly, Na/K pump current appears to be specifically tailored for a tissue by expression of a mix of functionally different types of pumps.
3
Sembler, William J. "The Design and Operation of Pumps Furnished for Marine Cargo Service: Part I—Centrifugal Cargo Pumps." Marine Technology and SNAME News 25, no. 01 (January 1, 1988): 1–29. http://dx.doi.org/10.5957/mt1.1988.25.1.1.
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To a pump manufacturer, marine cargo service represents one of the most demanding applications for which he can design and furnish equipment. In addition to being subjected to the stresses encountered in a shipboard environment, cargo pumps must often perform over a wide range of operating conditions and handle multiple fluids with different viscosities, vapor pressures, specific gravities, temperatures, and material requirements. In this paper the author reviews characteristics of the different types of pumps used for marine cargo service, with an emphasis on the special features that should be incorporated into their design for this rigorous duty. Different types of automatic self-priming/stripping systems available for use with these cargo pumps are also examined. Pump operation is discussed, including the significant impact that system design has on proper pump performance. (Because this paper is too large for publication in a single issue, Part II, on other types of cargo pumps, will appear in the next issue of MT, April 1988.)
4
Yan, Qiufeng, Yongkang Yin, Wanting Sun, and Jun Fu. "Advances in Valveless Piezoelectric Pumps." Applied Sciences 11, no. 15 (July 30, 2021): 7061. http://dx.doi.org/10.3390/app11157061.
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Piezoelectric pump design is regarded as a hot research topic in the microfluidic field, and has been applied in liquid cooling, precision machinery and other relevant domains. The valveless piezoelectric pump becomes an important branch of the piezoelectric pump, because it successfully avoids the problem of “pump-lagging of valve” during the valve piezoelectric pump processing. This paper summarizes the development of valveless piezoelectric pumps, and introduces some different configurations of valveless piezoelectric pumps. The structure and material of all kinds of valveless piezoelectric pumps are elaborated in detail, and also the output performance of the pump is evaluated and analyzed with the variations in flow rate and output pressure as reference. By comparing the flow of different types of valveless piezoelectric pumps, the application of valveless piezoelectric pumps is also illustrated. The development tendency of the valveless piezoelectric pump is prospected from the perspective of structure design and machining methods, which is expected to provide novel ideas and guidance for future research.
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Bierschenk, B. M., J. Pander, M. Mueller, and J. Geist. "Fish injury and mortality at pumping stations: a comparison of conventional and fish-friendly pumps." Marine and Freshwater Research 70, no. 3 (2019): 449. http://dx.doi.org/10.1071/mf18116.
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Pumping of water during floods from hinterland drainage systems into the main river poses a health risk to fishes and comparative studies are crucial to identify the most fish-friendly pump designs and operations. We investigated the effects on fish health of pump passages through four conventional and one ‘fish-friendly’ pump. All pump types caused external fish injuries leading to direct and delayed mortality. Immediate mortality and injury intensity increased with revolutions per minute (rpm) and differed significantly (P<0.05) between pump types. At the ‘fish-friendly’ Pentair pump (Fairbanks Nijhuis, London, UK), higher numbers of injuries resulting from blunt force (e.g. haemorrhage, scale loss and fin tears) were detected than at the conventional pumps, potentially due to the differences in blade design. The Köster pump (Köster, Heide, Germany) at low rpm proved to be similarly fish friendly as the specially developed fish-friendly Pentair pump due to the low number of entrained fishes. As a measure to reduce potential damaging to fishes, the pumps should run on low rpm as often as possible. This lowers the risk of collision with machine parts and hence mortality rate, as well as the suction effects see at high rpm. After long periods in an anergic state, pumps should generally run on low rpm before changing to higher rates.
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Majdan, Radoslav, Zdenko Tkáč, Rudolf Abrahám, Bohuslav Stančík, Milena Kureková, and Radoslav Paulenka. "Effect of Ecological Oils on the Quality of Materials of Hydraulic Pump Components." Advanced Materials Research 801 (September 2013): 1–6. http://dx.doi.org/10.4028/www.scientific.net/amr.801.1.
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This paper presents the effect of three oil types on the quality of hydraulic pumps after testing on a special test bench. The quality of material of hydraulic pump components was evaluated on the basis of its wear. In the special test bench, hydraulic pumps were loaded by cyclic pressure with different oil types. There were tested a mineral oil-based liquid HV and two biodegradable types, i.e. a vegetable oil-based liquid HETG and polyalphaolefin oil-based liquid HEPR. The wear level of hydraulic pumps was evaluated on the basis of flow efficiency and the weight and roughness of internal components. Laboratory scales were used to measure the weight of hydraulic pump components. Results of measured roughness and weights have been graphically compared. We noticed the most significant material wear on bearings and slide plates. The highest loss of weight was observed in the hydraulic pump tested with the ecological oil HETG. The highest loss of flow efficiency (7.3 %) was measured with the same oil type. This paper shows differences in the wear of hydraulic pumps after testing with different types of oils on the basis of selected methods of technical diagnostics.
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Sembler, William J. "The Design and Operation of Pumps Furnished for Marine Cargo Service: Part II." Marine Technology and SNAME News 25, no. 02 (April 1, 1988): 75–104. http://dx.doi.org/10.5957/mt1.1988.25.2.75.
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To a pump manufacturer, marine cargo service represents one of the most demanding applications for which he can design and furnish equipment. In addition to being subjected to the stresses encountered in a shipboard environment, cargo pumps must often perform over a wide range of operating conditions and handle multiple fluids with different viscosities, vapor pressures, specific gravities, temperatures, and material requirements. In this paper the author reviews characteristics of the different types of pumps used for marine cargo service, with an emphasis on the special features that should be incorporated into their design for this rigorous duty. Different types of automatic self-priming/stripping systems available for use with these cargo pumps are also examined. Pump operation is discussed, including the significant impact that system design has on proper pump performance.
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Lee, Jeong Hoon, Jong Myeong Lee, Jeong Min Ha, Dong Sik Gu, and Byeong Keun Choi. "Eigenvalue Analysis of Roots Type Vacuum Pump Using FE-Method." Materials Science Forum 762 (July 2013): 668–72. http://dx.doi.org/10.4028/www.scientific.net/msf.762.668.
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The demand and importance of vacuum pumps are increasing, because the necessity of dry vacuum pump is proven in semiconductor industry. Various types of vacuum pumps have been developed, and in this research a roots type vacuum pump has been analyzed with a variety of mathematical analysis. Analysis of eigenvalue by FEM analysis and Modal Test were performed through the Roots type vacuum pump and using the results of irregular vibration and instability an assessment has been performed.
9
Kalenik, Marek. "Investigations of hydraulic operating conditions of air lift pump with three types of air-water mixers." Annals of Warsaw University of Life Sciences, Land Reclamation 47, no. 1 (March 1, 2015): 69–85. http://dx.doi.org/10.1515/sggw-2015-0015.
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Abstract: Investigations of hydraulic operating conditions of air lift pump with three types of air-water mixers. The paper presents the analysis of results of the investigations concerning the influence of various constructive solutions of the air-water mixers on hydraulic operating conditions of the air lift pump. The scope of the investigations encompassed the determination of characteristics of delivery head and delivery rate for three types of air-water mixers applied in the constructed air lift pump. Using the obtained results, the efficiency of the three types of air-water mixers applied in this air lift pump was determined. The analysis was carried out and there was checked whether the improved analytical Stenning-Martin model can be used to design air lift pumps with the air-water mixers of these types. The highest capacity in the water transport was reached by the air lift pump with the 1st type air-water mixer, the lowest one – with the 3rd type air-water mixer. The water flow in the air lift pump increases along with the rise in the air flow. The lower are the hydraulic losses generated during flow of the air flux by the air-water mixer, the higher is the air lift pump capacity. Along with the rise in the water delivery head, the capacity of the air lift pump decreases. The highest efficiency is reached by the air lift pump with the 1st type air-water mixer, the lowest – with the 3st type air-water mixer. The efficiency of the air lift pump for the three investigated types of air-water mixers decreases along with the rise in air flow rate and water delivery head. The values of submergence ratio (h/L) of the delivery pipe, calculated with the use of the improved analytical Stenning-Martin model, coincide quite well with the values of h/L determined from the measurements.
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Liu, Yu-Wei, and Chen-Kang Huang. "Effects of the Circulation Pump Type and Ultraviolet Sterilization on Nutrient Solutions and Plant Growth in Plant Factories." HortTechnology 29, no. 2 (April 2019): 189–98. http://dx.doi.org/10.21273/horttech04244-18.
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Hydroponic systems in plant factories can be categorized into recirculating or noncirculating systems. In this study, the effects of various commercially available circulation pumps, including a centrifugal magnetic drive pump, a regenerative self-priming pump, and a submersible pump, were experimentally explored. In addition, the effects of an ultraviolet sterilization system on the ion concentrations in nutrient solutions were examined. The concentrations of sodium, potassium, magnesium, calcium, nitrate, sulfate, and ferric (Fe3+) ions in the nutrient solution were measured. For all three types of pumps, the results indicated that there was no significant effect on the concentrations of ions in the nutrient solution. However, the concentration of Fe3+ ions decreased significantly after the nutrient solution was treated by a ultraviolet sterilization system for 48 hours. In addition, the effects of the three types of pumps on the growth of butterhead lettuce (Lactuca sativa) were examined. The temperature records during the pump circulation tests showed that the nutrient solution temperature of the regenerative self-priming pump increased by 15.5 °C (from 20.5 to 36 °C), which caused yellow seedling, scorching on the leaves, and browning of the roots. The ion concentration in the nutrient solutions and total fresh weight of butterhead lettuce did not show any noticeable difference between the centrifugal magnetic drive pump and the submersible pump. In this paper, we clarify the cause of the decreasing iron concentration and provide a guideline for selecting the pump for circulating hydroponic systems in plant factories.
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Ahniar, Nur Hasanah, Hendra Marwazi, and Rismarini Yufita. "Comparison of Flowrate and Occlusion in a Vertical Infusion Pump and Horizontal Infusion Pump." Journal of Electronics, Electromedical Engineering, and Medical Informatics 2, no. 1 (January 5, 2020): 1–6. http://dx.doi.org/10.35882/jeeemi.v2i1.1.
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Infusion pump is a device used to enter fluid into the patient's body through a continuous. At present there are two types of infusion pumps namely vertical infusion pumps and horizontal infusion pumps. Both infusion pumps have different technologies. The aim of this study is to compare the performance results of the two infusion pumps. Infusion Pump is given 3 different liquid infusions, use 3 parameters flowrate setting (50 ml / h; 100 ml / h; 200 ml / h) and the data collection repeated for 5 times, with 3 minutes time for each parameter. The results of data collection will be tested using the normality test and difference test. Infusion Pump was calibrated first by using the Infusion Device Analyzer to check the condition of the tool. Based on the results of the T-test where the significant value is greater than 0.05, which means that the null hypothesis is accepted while the alternative hypothesis is rejected
12
Kawahito, K., Y. Takami, K. Makinouchi, and Y. Nosé. "HEMOLYSIS IN DIFFERENT TYPES OF CENTRIFUGAL PUMP." ASAIO Journal 42, no. 2 (March 1996): 58. http://dx.doi.org/10.1097/00002480-199603000-00214.
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Kawahito, K., Y. Takami, K. Makinouchi, and Y. Nose. "HEMOLYSIS IN DIFFERENT TYPES OF CENTRIFUGAL PUMP." ASAIO Journal 42, no. 2 (April 1996): 58. http://dx.doi.org/10.1097/00002480-199604000-00215.
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Truong, Dinh Quang, Kyoung Kwan Ahn, Nguyen Thanh Trung, and Jae Shin Lee. "Theoretical investigation of a variable displacement vane-type oil pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 3 (October 23, 2012): 592–608. http://dx.doi.org/10.1177/0954406212464615.
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Variable displacement vane-type oil pumps represent one of the most innovative pump types for industrial applications, especially for engine lubrication systems. This article deals with a mathematical modeling method for theoretical performance investigation of a typical variable displacement vane-type oil pump. This theoretical model is based on the pump geometric design and dynamic analyses. It can be considered as a generation step for a deeper understanding of the pump operation as well as for effectively implementing the pump control mechanisms to satisfy the urgent demands of engine lubrication systems. The developed theoretical pump model is finally illustrated by numerical simulations.
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Wang, Zheng, Mark B. Luther, Mehdi Amirkhani, Chunlu Liu, and Peter Horan. "State of the Art on Heat Pumps for Residential Buildings." Buildings 11, no. 8 (August 14, 2021): 350. http://dx.doi.org/10.3390/buildings11080350.
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Heat Pumps are becoming one of the most considered mechanical conditioning equipment in our buildings. While they are popular, there appears to be quite a vast range of system types and applications in building conditioning. This paper primarily reviews the literature on heat pumps, the various types, and the consideration of design end uses. The fact that there are different energy sources for heat pumps is considered, as well as the different sinks in which energy is stored or dissipated. It is evident that advanced heat pump systems cater well to the use of renewable energy resources. Therefore, in the move towards net-zero energy building operation, the correct selection of a heat pump can help to increase self-consumption of solar PV generation and even make use of direct solar energy heating. This paper reviews the technologies for heat pump selection, application, and design for residential buildings.
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Li, Tao, Weiming Zhang, Ming Jiang, and Zhengyang Li. "Experimental Study on Series Operation of Sliding Vane Pump and Centrifugal Pump." International Journal of Rotating Machinery 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/921283.
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A platform for sliding vane pump and centrifugal pump tests is installed to study the series operation of them under different characteristics of pipeline. Firstly, the sliding vane pump and the centrifugal pump work independently, and the performance is recorded. Then, the two types of pumps are combined together, with the sliding vane pump acting as the feeding pump. Comparison is made between the performance of the independently working pump and the performance of series operation pump. Results show that the system flow rate is determined by the sliding vane pump. In order to ensure the stability of the series operation pumping system, the energy consumption required by the pipeline under the system flow should be greater than the pressure energy centrifugal pump can generate. Otherwise, the centrifugal pump can not operate stably, with reflux, swirl, gas-liquid two-phase flow in the runner and strong vibration and noise. The sliding vane pump can be in serial operation with the centrifugal pump under limited conditions.
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Wang, Min, and Yue Jin Yu. "Analysis of Water Heat Pollution of Thermal Discharge in Surface Water Source Heat Pump System." Applied Mechanics and Materials 368-370 (August 2013): 364–68. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.364.
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To comprehensively evaluate surface water source heat pump system, the problem of water heat pollution of thermal discharge in surface water source heat pump system should be seriously considered. This study summarizes the causes and hazards of water heat pollution of surface water source heat pump, explores the characteristics of water heat pollution of lake-source heat pump system, river-source heat pump system and sea-source heat pump system respectively, and proposes several preventive measures for solving the problem. Concludes that surface water heat pumps discharges can change local water temperature, and various types of water bodies have different degree of heat pollution.
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Gai, Limei, Petar Sabev Varbanov, Timothy Gordon Walmsley, and Jiří Jaromír Klemeš. "Critical Analysis of Process Integration Options for Joule-Cycle and Conventional Heat Pumps." Energies 13, no. 3 (February 3, 2020): 635. http://dx.doi.org/10.3390/en13030635.
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To date, research on heat pumps (HP) has mainly focused on vapour compression heat pumps (VCHP), transcritical heat pumps (TCHP), absorption heat pumps, and their heat integration with processes. Few studies have considered the Joule cycle heat pump (JCHP), which raises several questions. What are the characteristics and specifics of these different heat pumps? How are they different when they integrate with the processes? For different processes, which heat pump is more appropriate? To address these questions, the performance and integration of different types of heat pumps with various processes have been studied through Pinch Methodology. The results show that different heat pumps have their own optimal application range. The new JCHP is suitable for processes in which the temperature changes of source and sink are both massive. The VCHP is more suitable for the source and sink temperatures, which are near-constant. The TCHP is more suitable for sources with small temperature changes and sinks with large temperature changes. This study develops an approach that provides guidance for the selection of heat pumps by applying Process Integration to various combinations of heat pump types and processes. It is shown that the correct choice of heat pump type for each application is of utmost importance, as the Coefficient of Performance can be improved by up to an order of magnitude. By recovering and upgrading process waste heat, heat pumps can save 15–78% of the hot utility depending on the specific process.
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Pietrzyk, Tobias, Markus Georgi, Sabine Schlittmeier, and Katharina Schmitz. "Psychoacoustic Evaluation of Hydraulic Pumps." Sustainability 13, no. 13 (June 30, 2021): 7320. http://dx.doi.org/10.3390/su13137320.
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In this study, sound measurements of an axial piston pump and an internal gear pump were performed and subjective pleasantness judgements were collected in listening tests (to analyze the subjective pleasantness), which could be seen as the inverse of the subjective annoyance of hydraulic drives. Pumps are the dominant sound source in hydraulic systems. The noise generation of displacement machines is subject of current research. However, in this research only the sound pressure level (SPL) was considered. Psychoacoustic metrics give new possibilities to analyze the sound of hydraulic drive technology and to improve the sound quality. For this purpose, instrumental measurements of the acoustic and psychoacoustic parameters are evaluated for both pump types. The recorded sounds are played back to the participants in listening tests. Participants evaluate them regarding the subjective pleasantness by means of paired comparison, which is an indirect scaling method. The dependence of the subjective pleasantness on speed and pressure was analyzed for both pump types. Different regression analyses were carried out to predict the subjectively perceived pleasantness or annoyance of the pumps. Results show that a lower speed is the decisive operating parameter for reducing both the SPL and the annoyance of a hydraulic pump.
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Buday, T., Gy Szabó, I. Fazekas, M. Paládi, Sz Szabó, G. Szabó, and A. Kerényi. "Annual pattern of the coefficient of performance considering several heat pump types and its environmental consequences." International Review of Applied Sciences and Engineering 5, no. 2 (December 1, 2014): 173–79. http://dx.doi.org/10.1556/irase.5.2014.2.10.
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Heating with the use of ambient energy by heat pumps is a very effective way to reduce CO2 emission. However, efficiency, economic and environmental advantages depend on the type of the heat pump and the temperature of the source, the latter usually changes during the heating season. The aim of the paper is to give the annual pattern of the COP and emission as a function of the typical source temperature pattern, moreover yearly summarized energetic and emission values are also added in the case of air source, water source and ground source heat pump systems, compared to some conventional heating mode.
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Inaguma, Yoshiharu. "Oil temperature influence on friction torque characteristics in hydraulic pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 9 (December 1, 2011): 2267–80. http://dx.doi.org/10.1177/0954406211430572.
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This article presents a practical approach to the investigation of the influence of oil temperature on the friction torque in various types of hydraulic pumps using a mathematical model. Currently, an external gear, an internal gear or a vane pump is commonly used for an automatic transmission. These pumps have their own friction torque characteristics, which depend not only on pump-operating conditions such as operating pressures, pump speeds and oil temperature but also on structures and dimensions of the pumps. For various pumps, however, the friction torque characteristics can be represented by an identical mathematical model. In the pump-operating conditions, the oil temperature significantly and complicatedly affects them. The pump should be operated under conditions to obtain a higher mechanical efficiency, and the mathematical model is helpful to analyse how the oil temperature influences the friction torque. It is found that with an increase in oil temperature, the friction torque at a high pump speed decreases in a low oil temperature region, but it would not decrease in a high oil temperature region for all the tested pumps. This fact suggests that the pump overall efficiency would not improve at a high oil temperature, even if the volumetric efficiency does not go down.
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Gavade, Ramesh S., and Suresh M. Sawant. "Study of Mechanical Performance Affecting Factors in Split Casing Pump." International Journal of Engineering and Advanced Technology 10, no. 2 (December 30, 2020): 31–37. http://dx.doi.org/10.35940/ijeat.b1992.1210220.
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The need for better performance and higher comfort continually drive search for new features. In today’s applications, pumps are expected to continue continuously for a long time. So “operational reliability” is a key factor. The comprifugal pump is a fluid-carrying machine, with centrifugal energy produced by rotating air. Pumps are used for conveying fluids. Rotating power usually comes from an electric car, which is turned by the engine and the engine. There is a great demand for centrifugal pumps on the market. The construction is relatively inexpensive, durable and easy, and its high speed makes it possible to connect the pump directly to an unmatched car. The centrifugal pump provides a constant flow of fluid, and can be easily blown without causing damage to the pump. Pump reliability problems address a large amount of repair repairs and the cost of loss of access to chemical plants, refineries, and many electrical appliances. This paper describes the most common causes of pump failure, and how they can be avoided in most cases by using the appropriate types of analysis and procedure during the pump selection process. Specifically, key issues include where the pump will operate next to the best efficient point (BEP). Proper pump selection and installation avoid misalignment. This paper explains the various reasons for the failure of Split break pumps.
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Baranov, A. Yu, M. I. Davydenko, Ye V. Sokolova, and O. A. Filatova. "Increasing the pump energy efficiency of the system for discharging liquefied natural gas from large-capacity storage facilities via design improvement." Herald of Dagestan State Technical University. Technical Sciences 48, no. 2 (July 31, 2021): 9–19. http://dx.doi.org/10.21822/2073-6185-2021-48-2-9-19.
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Abstract. Objective. To determine the most relevant way to improve the energy efficiency of the system for discharging liquefied natural gas (LNG) from large-capacity storage facilities. Methods. The method of analysis of existing systems for LNG discharge from storage tanks was used to identify critical (emergency) elements of the system to be improved and possible options of improving structural elements. Results. The operation of the system for discharging LNG from storage tanks was analysed and its main characteristics were described. Main problems associated with designing and building borehole pumps, as well as goals and tasks of designing new borehole pump structures were studied. The main types of LNG borehole pumps, their varieties, and types of drives were studied to choose the most optimal new option of improving pumps for systems for discharging LNG from storage tanks. Further, it will be necessary to calculate geometric parameters of the hydroturbine and operation modes of its wheel being in connection with the centrifugal pump wheel. Conclusion. Experience of using storage facilities shows that LNG pumps are the most critical units significantly increasing production risks. Therefore, the LNG borehole pump design improvement was chosen as a method to increase the energy efficiency of the system for discharging LNG from large-capacity storage facilities. Based on the considered advantages and disadvantages of structural elements of the existing LNG borehole pump design, we chose the replacement of the electric pump drive with an alternative one as the most optimal improvement method.
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Sliwinski, Paweł. "New Satellite Pumps." Key Engineering Materials 490 (September 2011): 195–205. http://dx.doi.org/10.4028/www.scientific.net/kem.490.195.
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Stosowanie Maszyn company from Katowice was initiator and originator of newest original high pressure satellite pumps series of types PSM. Construction solution, research and development of these pumps have been conducted by Team of Hydraulics and Pneumatics of Gdansk University of Technology in cooperation with this company within the confines of research project nr R0300103 (source of funds: Ministry of Science and Higher Education). Prof. A. Balawender was the manager of this project. Working medium for these pumps may be oil, emulsion HFA-E and water. Results of laboratory research of the pump would be presented in the article. Results of research contain: volumetric losses, hydraulic-mechanical losses, efficiencies of those pump and their characteristics of noise. For all types of pumps from PSM series characteristics are similar.
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Mimmi, G. C., and P. E. Pennacchi. "Involute Gear Pumps Versus Lobe Pumps: A Comparison." Journal of Mechanical Design 119, no. 4 (December 1, 1997): 458–65. http://dx.doi.org/10.1115/1.2826390.
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In previous studies we have considered several types of positive displacement rotary pumps and deeply analyzed the generation of the flow rate and the design limits. This has been done in order to evaluate the main performance indexes; one of which, the flow rate irregularity, is related to the possibility that the pump becomes a source of vibration and noise. A second index is the specific flow rate, related to the delivery capacity of the pump. In this paper, following our previous researches, we analyzed internal involute gear pumps and internal lobe pumps, that have similar operations but different performances. The design parameters and the way to optimize the performances are proposed for both cases. Finally a comparison is made between the two types of pumps with optimum design parameters.
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Şeflek, Ali Yavuz. "Dalgıç Tip Atık Su Pompalarının Karakteristiklerinin Belirlenmesine Yönelik Test Sistemi Tasarımı." Turkish Journal of Agriculture - Food Science and Technology 7, no. 3 (March 12, 2019): 475. http://dx.doi.org/10.24925/turjaf.v7i3.475-478.2455.
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In this study; Design and production of a fixed testing platform is made for determining characteristics properties of submersible type waste water pumps that requires between 3 - 22 kW energy. Submersible waste water pumps are used for agricultural plants (for transporting liquid animal fertilizer etc.), drain aging of waste water in bridges and underpasses and other industrial applications. Accurate determination of pump performances in pump manufacturing directly affects the improvement and development of R & D activities For this aim, this study was carried out in a firm which operates in Konya industry and produces different types of pumps. The test stand has been designed and manufactured in 3 different lines as DN 80, DN 125 and DN 150 standard pipe diameters according to TS 12599 standard and centrifugal pump design principles. At the end of the pump tests, the system creates the pump characteristic curves and gives the output data to the user.
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Fuchiwaki, Masaki, Yoshitaka Naka, and Kazuhiro Tanaka. "Performance of a Micro Pump Driven by Conducting Polymer Soft Actuator Based on Polypyrrole." Advanced Materials Research 93-94 (January 2010): 615–18. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.615.
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Micro pumps are essential components of micro-fluidic systems and bio-sensing systems. In particular, the micro pump used for -TAS transports fluids at a micro flow rate with high precision. This micro pump is also used to transport high-viscosity fluids because there are various types of drugs to be transported. We developed a micro pump driven by a conducting polymer soft actuator that opens and closes. Although the developed micro pump contains no valve, the micro pump can transport fluids in one direction without backflow. A newly developed micro pump driven by a conducting polymer soft actuator can transport fluids in one direction without backflow by the opening and closing of two soft actuators.
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Li, Yan Zhi, Li Huan Gao, and Xiao Yang Tang. "The Flow Pulsation Analysis of an External Gear Pump." Advanced Materials Research 236-238 (May 2011): 2327–31. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2327.
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In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. External gear pumps with three different types of tooth profiles are studied. Nondimensional flowrates and fluctuation coefficients of gear pumps are discussed. By using the formula, flowrates can be calculated accurately and efficiently. Results indicate that: in the case of the same displacement (except teeth number and tooth width, other parameters of the gear pump are the same) the gear pump flow pulsation decreases with the increasing of the teeth number. We also concluded that changing tooth profiles on the driving and driven gear can get different pulse amplitude of the flow ripple.
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Liu, Bin, Lin Chai, Aiqiang Chen, Fuhui Tang, Khellil Sefiane, and Georges E. I. Achkar. "Effects of vapor injection modes on the heating performance of heat pumps." European Physical Journal Applied Physics 86, no. 3 (June 2019): 30902. http://dx.doi.org/10.1051/epjap/2019190126.
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Heat pumps are widely investigated for their versatile use in a wide range of applications. In this study, three types of heat pumps were experimentally compared. These heat pumps include an one-stage without injection vapor heat pump, an one-stage injection vapor heat hump and a two-stage injection vapor heat pump with an economizer. The results showed that the heating capacity of all three variants of heat pumps decreases with the decrease of the evaporation temperature. However, the attenuation ratio of the heating capacity is found to be different from one pump to another. On the one hand, the largest attenuation rate is found to be 68.84% for evaporating temperatures ranging from −1 °C to −23 °C and for the case of one-stage heat pump. On the other hand, the smallest attenuation rate is found to be 31% for the two-stage injection vapor heat pump in the same temperature range. It is worth noting that the heating efficiency is improved by the amount of vapor injection, nevertheless, there is a maximum value due to the limitations of the economizer. The two-stage injection vapor heat pump can exhibit an enhanced heating efficiency of 127% compared to the one-stage without injection vapor heat pump and 13% compared to the one-stage injection vapor heat pump for an evaporating temperature of −23 °C.
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Ohashi, Hideo, and Yoshinobu Tsujimoto. "Pump Research and Development: Past, Present, and Future—Japanese Perspective." Journal of Fluids Engineering 121, no. 2 (June 1, 1999): 254–58. http://dx.doi.org/10.1115/1.2822199.
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The evolution of pump research and production in Japan after 1955 is surveyed. The post-war period has been divided into three stages of development with unique social and industrial characteristics: expansion, conversion, and globalization. The growth of pump production in sales amount and quantity is shown for various types of pumps. The post-war direct and indirect research on pumps is classified into eight groups of topics and their past trends are analyzed. These changes are correlated with the characteristics of the corresponding background stage. These analyses with the past suggest new trends of research for pumps of tomorrow.
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Harvey, P. A., and T. Drouin. "The case for the rope-pump in Africa: A comparative performance analysis." Journal of Water and Health 4, no. 4 (December 1, 2006): 499–510. http://dx.doi.org/10.2166/wh.2006.0033.
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The conventional handpump is the most popular technology choice for improved potable water supplies in rural sub-Saharan Africa. To date, however, it has failed to deliver satisfactory levels of sustainability, largely due to inadequate maintenance capacity. An alternative option to standardised imported handpumps is the locally manufactured rope-pump, which is considerably cheaper and easier to maintain but has been rejected in the past due to fears of impaired water quality. This paper presents the key aspects of a study in northern Ghana which compared the performance of rope-pumps with that of conventional handpumps, to determine whether or not the rope-pump provides a viable alternative for community water supplies across the sub-continent. User interviews, sanitary surveys, water quality analyses and technical performance measurements were used to develop a comparative performance analysis for the two pump types. The findings of the study indicated that the rope-pump out-performed the conventional handpump on the majority of counts and that, contrary to widespread perceptions, there was no significant difference between pump types with respect to the impact on microbiological water quality. Consequently, the rope-pump provides a significant technological opportunity to improve water supply sustainability in Africa.
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Inaguma, Yoshiharu. "A practical approach for analysis of leakage flow characteristics in hydraulic pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 5 (August 9, 2012): 980–91. http://dx.doi.org/10.1177/0954406212456933.
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This article presents a practical approach to leakage flow analysing for various types of hydraulic pumps. In this study, the influence of pump-operating conditions such as operating pressures, pump speeds and oil temperature on the leakage flow characteristics is investigated and a mathematical model to calculate the leakage flow is proposed. Currently, an external gear, an internal gear or a vane pump is commonly used for an automatic transmission. These pumps have their own leakage flow characteristics, which depend not only on pump-operating conditions but also on structures and dimensions of the pumps. For various pumps having different constructions, the delivery pressure and the oil temperature differently affect the leakage flow characteristics and especially the delivery pressure also changes the clearances causing the leakage flow. A mathematical model for the leakage flow, which takes into account a change in the thickness of clearance according to the delivery pressure, represents accurately the actual leakage flow characteristics in various pumps. Also, it clarifies the influence of the pump-operating conditions on their leakage flow characteristics. In the external and internal gear pumps, the leakage flow would not approach zero due to an existence of the orifice flow leakage almost independent of the viscosity of oil, even at an extremely low oil temperature. This leakage flow influences significantly the volumetric efficiency at a low oil temperature in the gear pumps.
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Wu, Jun Fei, and Wei Gao. "The Finite Element Analysis of Two Line Types of Three-Thread Single-Screw Pump." Advanced Materials Research 204-210 (February 2011): 1175–79. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1175.
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In order to find out the advantages and shortcomings of two line types of three-thread single-screw pump, the comparative analysis method is initially used on the same kind screw pump of different line types .By using ANSYS，this paper adopted the finite element analysis to analyze the deformation、stress and strain of outer equidistant curve of curtate hypocycloid and inner equidistant curve of curtate epicycloids two line types three-thread single-screw pump under uniform pressure and 1MPa differential pressure .It focuses on discussing over the rubber stator of screw pump suffers influenced by the above three factors. The result shows that the existence of uniform pressure makes an uniform radial displacement of the rubber stator; the 1MPa differential pressure makes a great deformation of the rubber stator and the value of stress and strain also increases accordingly, by comparative analysis of two line types of three-thread single-pump, the sealing property of outer equidistant curve of curtate hypocycloid three-thread single-screw pump takes more advantages rather than inner equidistant curve of curtate epicycloids three-thread single-screw pump.
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Dunham, P., and C. Anderson. "On the mechanism of stimulation of the Na/K pump of LK sheep erythrocytes by anti-L antibody." Journal of General Physiology 90, no. 1 (July 1, 1987): 3–25. http://dx.doi.org/10.1085/jgp.90.1.3.
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Studies were undertaken to explore the mechanism of stimulation of the Na/K pump in LK sheep erythrocytes by anti-L antibody. First, the numbers of functioning pump sites were determined by correlating [3H]ouabain binding with levels of inhibition of the pump. Untreated (control) cells had approximately 41 pumps per cell, and anti-L treatment caused an increase in the number of functioning pumps to approximately 85 per cell. Reducing the intracellular K concentration, [K]c, to near zero caused an increase in the number of pumps in control cells, but not in anti-L cells, such that the numbers of pumps per cell were about the same in the two cell types. These results led to the prediction that Kc is a noncompetitive inhibitor of the pump in control cells, and that anti-L stimulates the pump and increases number of functioning pumps by reducing noncompetitive inhibition by Kc. Kinetic studies were undertaken to test this prediction: activation of the pump by increasing [Na]c was measured at three fixed levels of [K]c. In control cells, the apparent maximum velocity of the pump (J'max) was reduced approximately threefold by raising [K]c from 0.2 to 9 mmol/liter cells, demonstrating noncompetitive inhibition by Kc. In anti-L cells, J'max did not vary with [K]c, which shows that, as predicted, anti-L abolishes the noncompetitive inhibition by Kc. The modification of the kinetic properties of the pumps by the antibody is highly specific in that affinities for Nac and Ko as substrates are unaffected. However, the effect of the antibody on noncompetitive inhibition by Kc does not explain the stimulation of the pump fully since there is significant stimulation at near-zero [K]c.
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Ovchinnikov, N., V. Portnyagina, and B. Dambuev. "Specifying the technical state limit value of the pump pulp without disassembling." Journal of Mining Institute 241 (February 25, 2020): 53. http://dx.doi.org/10.31897/pmi.2020.1.53.
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The northern part of the territory of the Republic of Sakha (Yakutia) is rich in vast deposits of diamonds. These deposits are developed by the mining company “Almazy Anabara”, which is engaged in the extraction of diamonds at seasonal processing plants using various technological equipment. One of the key types of equipment is the pulp pump of a foreign company “KETO”. The work of pulp pumps of this company in the enrichment of diamond-containing raw materials is accompanied by intensive hydroabrasive wear of their impellers, the service life of which usually does not exceed three months.In practice, untimely replacement of a worn impeller can lead to emergency breakdowns of sealing elements and bearings, which is explained by super-permissible deflections of the shaft of pumping equipment arising from a significant unbalance of the rotor.The main cause of breakdown of slurry pumps at “Almazy Anabara” seasonal processing plants is the inability to quickly identify their ultimate technical condition, the key sign of which is the maximum wear of the impeller.The seasonal beneficiation plants of “Almazy Anabara” currently need a simple and at the same time reliable diagnostic sign of pulp pumps reaching their ultimate technical state, the identification of which can be quickly performed without disassembling and using complex equipment, which is very important when operating pumping equipment in short wash season on the Far North.
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GĘCA, Michał, Konrad PIETRYKOWSKI, and Grzegorz BARAŃSKI. "Coolant pump for compression-ignition aircraft engine." Combustion Engines 179, no. 4 (October 1, 2019): 52–57. http://dx.doi.org/10.19206/ce-2019-408.
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The article presents an analysis of the design of cooling liquid pumps for a compression-ignition aircraft engine. A 100 kW twin- charged, two-stroke, liquid-cooled engine has 3 cylinders and 6 opposed-pistons. In the first part of the study, the amount of heat needed to be removed by the cooling system was estimated to obtain the required volumetric flow rate. Then, the design of automotive cooling liquid pumps for compression-ignition engines with a Common Rail power supply system and power of about 100 kW was analyzed. The aim of the analysis was to select a suitable pump for applications in the aircraft compression-ignition engine. 5 constructions of different shape, diameter and width of the working rotor were selected. The pressure and volume flow rate were determined for a given rotational speed of the pump on a specially built stand. The operation maps of individual pumps were created to select the most efficient types of pumps.
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Mitamura, Hiroaki, and Masaki Fujie. "Evolutionary Transition of Stormwater Pump System in Tokyo." Journal of Disaster Research 16, no. 3 (April 1, 2021): 421–28. http://dx.doi.org/10.20965/jdr.2021.p0421.
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One of the roles of sewerage is to effectively discharge stormwater and protect urban areas from inland flooding, but there are several challenges to overcome. Urban development is progressing in Tokyo, and the amount of stormwater flowing into the sewers is increasing. In order to respond to the increase in the frequency of heavy rainfall in recent years, it is necessary to improve the capacity of stormwater pumps. The Bureau of Sewerage Tokyo Metropolitan Government has been working on the technological development of higher-performance stormwater pumps since the 1950s, when initial-type stormwater pumps were installed. The technological development history of stormwater pumps in Tokyo can be broadly divided into four periods. The first period spanned approximately 30 years when initial-type pumps, which start to operate after stormwater flows into the pump station, were active. In the second period, which spans approximately 20 years from 1980, two types of pumps were developed; a non-water supply pump that could operate reliably even in an earthquake, and a standby operation pump that could respond to sudden stormwater inflow during torrential rains. The third period spans approximately 15 years from 1999, when the waterless standby pump, which integrated the features of the two pumps developed in the second period, was developed and introduced. The fourth period is the era of pumps with higher performances than third period pumps developed after 2015. Currently, these stormwater pumps are operated together with a rainfall radar system that accurately grasps the rainfall situation and protects the citizens of Tokyo from inland flooding.
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Stachel, K., H. U. Frutschi, and H. Haselbacher. "Thermodynamic Heating With Various Types of Cogeneration Plants and Heat Pumps." Journal of Engineering for Gas Turbines and Power 117, no. 2 (April 1, 1995): 251–58. http://dx.doi.org/10.1115/1.2814088.
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The thermodynamic heating method combines cogeneration power plants and heat pumps in order to maximize the heating energy that can be derived from a given amount of fuel. In doing this, unnecessary waste of primary energy and environmental damage can be prevented. In this paper, four cogeneration systems—combined cycle plants, steam and gas turbine power plants, and gas engines—and heat pump systems are investigated and compared with respect to fuel utilization for realistic site conditions. It is shown that the combined cycle cogeneration power plant is superior to the other three types of power plant.
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Ledukhovsky, G. V., S. D. Gorshenin, E. V. Zinovyeva, and A. S. Zinovyeva. "Analysis of efficiency of feed pump control by changing rotation of rotor for power plants of various types." Vestnik IGEU, no. 4 (August 31, 2021): 5–14. http://dx.doi.org/10.17588/2072-2672.2021.4.005-014.
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The type of power plant feed pump drive is selected in the course of a feasibility study. Domestic experience is based on recommendations that have been obtained in the middle of the last century when fuel was relatively cheap. These recommendations are currently being revised. Manufacturers of technological tools of pumps frequency control offer to install fluid couplings, variable frequency electric drives or drive turbines for power plants of various types. At the same time, they declare the high efficiency of such solutions. But the effect is often calculated based on energy savings indicators for the pump drive without considering changes of the operating modes of other equipment of the power plant. An urgent task is a comprehensive assessment of the effectiveness of the measures under consideration. This assessment should consider the objective parameters and modes of facilities operation, as well as interrelation of power electricity cost for own needs and loads of the basic equipment. To determine the technical effect of application of various methods of frequency control of feed pumps, models are used that are developed on the individual basis for each power plant based on the energy characteristics of the equipment. These models include algorithms for heat and electrical balances. Operational characteristics of the feed pumps and performance assessment are calculated according to the known techniques. Based on a unified methodological approach, the authors have developed mathematical models of condensing power supply units and combined heat and power plants for an initial pressure of 12,8 MPa. These models make it possible to determine the effect of frequency control of feed pumps based on data for real time in operation considering the interrelation of power electricity cost for own needs and loads of the basic equipment. Calculation of index of performance of application of various means of frequency control of feed pump performance have been carried out. It is revealed that to assess the efficiency of application of technological tools of frequency control of feed pumps, it is of decisive importance to consider the experience of equipment load, load schedules, the interrelation of power electricity cost for own needs and loads of the basic equipment. No general recommendations to use certain methods of feed pumps control are applicable, when conducting such an assessment.
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Wang, Weijun, and Zhenggui Li. "Influence of different types of volutes on centrifugal aviation fuel pump." Advances in Mechanical Engineering 13, no. 3 (March 2021): 168781402110052. http://dx.doi.org/10.1177/16878140211005202.
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High efficiency and low vibration are two hot topics in the field of fluid mechanics. In this paper, different spiral volutes are designed for centrifugal aviation fuel pump based on Velocity Coefficient Method. Physical fields under different operating conditions are simulated by computational fluid dynamics (CFD) software that solved the Navier–Stokes equations for three-dimensional flow (3D-RANS). And theoretical and simulation values of radial and axial forces are analyzed. The unsteady pressure fluctuation based on the steady results at the monitoring point is solved and Fast Fourier Transform (FFT) is used to obtain the influence of different volutes on pressure pulsation. The influence of three volutes on is analyzed and compared with the simulation. The results show that the double volutes improve significantly the large flow efficiency of the aviation fuel pump, 20%–30% higher than that of the single volute. The doubles volute can also optimize the radial force under the off-design condition. The radial force of the single volute fuel pump is 100 N. The radial force of the two types of double volute fuel pump is between 10 and 20 N. The three types of volute have no obvious influence on the axial force. Two types of double volutes provide excellent suppression of fuel pump pulsation spikes over the full frequency range. The peak value of single volute is mainly concentrated in the low frequency area below 2000 Hz. The blade frequency (170 Hz) and frequency multiplication are the main frequencies of the pulsation and the pulsation decreases rapidly in the high frequency area. The research results provide theoretical support for the design of aviation fuel pump with low pressure pulsation.
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Kim, Won-Sik, and Jeong-Eui Yun. "CFD Analysis on the Balancing Hole Design for Magnetic Drive Centrifugal Pumps." Energies 13, no. 22 (November 10, 2020): 5865. http://dx.doi.org/10.3390/en13225865.
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Balancing holes in single-suction centrifugal pumps are generally applied to attenuate the axial thrust caused by a pressure difference between the front side of a shroud and the rear side of a hub of an impeller. The magnetic drive pump, the subject of this study, has a leak-free airtight structure and an integrated structure of the impeller and inner magnet. To prevent the performance degradation of the magnetic drive caused by heat during operation, complex cooling flow paths connected to balancing holes have been designed so that a sufficient amount of coolant would flow around the magnetic drive. Due to this spatial characteristic, when balancing holes are applied to a magnetic drive pump, the balancing hole flow path becomes very long compared to that of balancing holes applied to conventional pumps. When the balancing hole flow path is long, the flow path loss increases, which in turn increases the adverse effect of balancing holes on the pump performance. Therefore, the design of highly efficient balancing holes to which a sufficient amount of coolant can be supplied is critical in a magnetic drive pump. To this end, two types of balancing holes were investigated in this study. First, balancing holes are drilled in the impeller that rotates during operation. Second, balancing holes are drilled in the inner shaft installed to maintain the centre of rotation of the impeller during pump operation. The results confirmed the flow characteristics of the two types of balancing holes and verified the effect of each balancing hole on the pump performance. Finally, this study found that drilling balancing holes in the shaft were appropriate for the magnetic drive pump, and this type can maintain relatively high efficiency and supply a sufficient amount of coolant to maintain the efficiency of the magnetic drive.
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Lee, Angela, Weimin Mao, Mark S. Warren, Anita Mistry, Kazuki Hoshino, Ryo Okumura, Hiroko Ishida, and Olga Lomovskaya. "Interplay between Efflux Pumps May Provide Either Additive or Multiplicative Effects on Drug Resistance." Journal of Bacteriology 182, no. 11 (June 1, 2000): 3142–50. http://dx.doi.org/10.1128/jb.182.11.3142-3150.2000.
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ABSTRACT The effects of simultaneous expression of several efflux pumps on antibiotic resistance were investigated in Escherichia coliand Pseudomonas aeruginosa. Several combinations of efflux pumps have been studied: (i) simultaneous expression of a single-component efflux pump, which exports antibiotics into the periplasm, in combination with a multicomponent efflux pump that accomplishes efflux directly into the external medium; (ii) simultaneous expression of two single-component pumps; and (iii) simultaneous expression of two multicomponent pumps. It was found that when efflux pumps of different structural types were combined in the same cell (the first case), the observed antibiotic resistance was much higher than that conferred by each of the pumps expressed singly. Simultaneous expression of pairs of single-component or multicomponent efflux pumps (the second and third cases) did not produce strong increases in antibiotic resistance.
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Frei, B., and H. Huber. "Characteristics of different pump types operating with ice slurry." International Journal of Refrigeration 28, no. 1 (January 2005): 92–97. http://dx.doi.org/10.1016/j.ijrefrig.2004.07.006.
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Abdyukova, R. Ya. "Studies on operation and types of drilling pump valves." IOP Conference Series: Materials Science and Engineering 560 (July 10, 2019): 012050. http://dx.doi.org/10.1088/1757-899x/560/1/012050.
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Zang, Wei, Xin Cheng Li, Yi Chen, and Yu Ting Luo. "Numerical Study of the inside Flow Field and the Rectangle Channel Impeller of Roto-Jet Pump." Applied Mechanics and Materials 529 (June 2014): 164–68. http://dx.doi.org/10.4028/www.scientific.net/amm.529.164.
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By means of ANSYS-CFX, the 3D numerical simulations of flow field for the three hydraulic models are performed. Through comparing the three types of pumps with three different rectangle channel impellers which have different spread angle, blade, the authors draw conclusions: the distribution of the pressure and velocity in the rectangle flow channels with 6° spread angle is well-proportioned, the head and the efficiency of the whole pump can meet the requirement: But the other two types of impeller channels, the distribution of velocity is unstable, there are backflow and big whirlpool. Therefore, the rectangle channel impeller with 6°spread angle is a better type for the Roto-Jet pump.
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Al-Hashmi, Salem A. "Condition monitoring of Electrical Submersible Pumps (Faults review)." Journal of Pure & Applied Sciences 20, no. 1 (March 14, 2021): 71–74. http://dx.doi.org/10.51984/jopas.v20i1.1070.
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This paper is a part of condition monitoring of electrical submersible pumps (ESP). It assigned for reviewing and discussing faults or malfunctions of this kind of pumps. Therefore, it reviews all-important information related to this machine such as construction and operation. It focuses specifically on faults and details of these types of fault. Although there are slight differences between building submersible pumps in terms of the different technologies that different manufacturers use in making this type of pump, all kinds of these types of pumps are almost the same. In this context, pumps faults were reviewed based on major and common failures of this type of pumps.
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Skliar, A., and R. Skliar. "Analysis of the operation of pumps when used in biogas plants." Mehanization and electrification of agricultural, no. 10(109) (2019): 169–77. http://dx.doi.org/10.37204/0131-2189-2019-10-17.
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Purpose. Analyze the operation of pumps when used in biogas plants and the features of their use. Provide guidance on the use of different types of pumps, their advantages and disadvantages, and features of maintenance. Methods. In the analysis of different types of pumps the methods of system and comparative analysis, scientific generalizations and method of argumentation are used. Results. The article analyzes existing pump designs for pumping manure (substrate). The comparative characteristics of the following pumps, which are most commonly used in biogas plants, are given: centrifugal, eccentric auger and rotary piston. As a result of the analysis the characteristics of their application, advantages and disadvantages, variants of structures and features of maintenance were obtained. Conclusions. The choice of suitable pumps according to the capacity and characteristics depends largely on the substrates used, their degree of preparation and/or dry matter content. An analysis of existing designs has shown that the use of plunger pumps (especially rotary ones) has many advantages over centrifugal ones: the ability to work with viscous substrates, self-priming and more pressure stable, suitable for substrate dosing, easy to maintain. Keywords: pump, biogas plant, methane tank, substrate, sludge, dry matter, manure.
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Zaili, Zarin Syukri, Ahmad Anas Yusof, Nur Fathiah Mohd Nor, Mohd Hafidzal Mohd Hanafi, and Mohd Qadafie Ibrahim. "Characteristics of a Reciprocating Pump for Low-Cost Sustainable Water Hydraulic Technology Demonstrator." Applied Mechanics and Materials 699 (November 2014): 736–41. http://dx.doi.org/10.4028/www.scientific.net/amm.699.736.
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An investigation of water-based reciprocating triplex piston pump was conducted to propose a low cost solution for the substitution of the traditional oil hydraulics to water hydraulics. Triplex pumps used in this investigation as the water hydraulics require continuous pumping. These pumps are capable of handling a wide range of fluid types, including corrosive fluids, abrasive fluids, and slurries containing relatively large particulates. Thus, an evaluation of the triplex pump using a simple simulation process that focuses on the volumetric efficiency has been conducted in order to understand its ability in energy-efficient system. In this paper, the results of a simulated study of a positive displacement triplex piston pump are presented. The result concludes that the use of water is relatively efficient if the slip factor is maintained to 0.003, with the system pressure is set from 10 to 40 bar.
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Chomiuk, Bartłomiej, and Janusz Skrzypacz. "Analysis of the influence of a stator type modification on the performance of a pump with a hole impeller." Open Engineering 9, no. 1 (July 20, 2019): 218–28. http://dx.doi.org/10.1515/eng-2019-0029.
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AbstractThe article presents the results of numerical analyses and experimental research of the influence of various types of stators on a liquid flow through a centrifugal pump with a hole impeller. It is a continuation of authors research of cooperation pump stators with alternative types of impellers which work in ultra low specific speed. Hole impellers have become a significant alternative to classical ones in a range of extremely low specific speed nq<10. The aim of the research is to verify the quality as well as quantity of computer modeling results, and to estimate accuracy by examining the impact of a grid and a turbulence model with which the numerical simulations reflect the actual flow.Knowledge concerning construction of hydraulic elements of centrifugal pumps working in the range of parameters corresponding specific speed (nq<10) is insufficient. The outlet elements were tested in various configurations of constructional features. The complexity of the construction of the stator can significantly affect the manufacturing costs of pump unit.
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Kustosz, R., I. Altyntsev, M. Darlak, T. Wierzchoń, M. Tarnowski, M. Gawlikowski, M. Gonsior, and M. Kościelniak-Ziemniak. "The Tin Coatings Utilisation As Blood Contact Surface Modification In Implantable Rotary Left Ventricle Assist Device Religaheart Rot." Archives of Metallurgy and Materials 60, no. 3 (September 1, 2015): 2253–60. http://dx.doi.org/10.1515/amm-2015-0371.
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Abstract Constructions of the mechanical-bearingless centrifugal blood pumps utilize different types of non-contact physical bearings, which allows to balance the forces that have an impact on the pump impeller, stabilizing its position in the pump house without wall contact. The paper presents investigations of the hybrid (passive magnetic bearings and hydrodynamic bearings) suspension system for the centrifugal blood pump. Numerical simulations were used to evaluate the hydrodynamic bearing lifting force and magnetic bearing forces interaction. An important aspect of rotor suspension system design was the nominal gap in hydrodynamic bearing area in order to reduce the blood damage risk in this region. The analyses results confirmed that for a small diameter centrifugal pump, the nominal operating hydrodynamic bearing gap could be established within the range from 0.033 to 0.072 mm.