Relevant bibliographies by topics / Liquid ring pump

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Liquid ring pump'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Liquid ring pump"

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Qiu, Guang Qi, Si Huang, Lan Lan Zhu, Yu Chen, and Jing He. "Performance Monitoring Analysis of Liquid Ring Vacuum Pumps." Applied Mechanics and Materials 853 (September 2016): 463–67. http://dx.doi.org/10.4028/www.scientific.net/amm.853.463.

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Liquid ring vacuum pump which uses rotating liquid as piston to abstract and compress gas is a kind of rotating positive displacement pump. Its running state implies some fault informantion. To capture performance levels of liquid ring vacuum pump, a comprehensive performance monitoring system includes data acquisition, data reprocessing, data storage, abnormal judgment and fault alarm, performance displaying is developed in this paper. Hence, the performance levels of liquid ring vacuum pump can be observed anytime by the monitoring system, the maintenance cost can be reduced, pumps can be operated at the highest performance level as far as possible, the reliability and the maintainability of liquid ring vacuum pump can be effectively improved by this monitoring system.
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Huang, Si, Jing He, Xueqian Wang, and Guangqi Qiu. "Theoretical Model for the Performance of Liquid Ring Pump Based on the Actual Operating Cycle." International Journal of Rotating Machinery 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/3617321.

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Liquid ring pump is widely applied in many industry fields due to the advantages of isothermal compression process, simple structure, and liquid-sealing. Based on the actual operating cycle of “suction-compression-discharge-expansion,” a universal theoretical model for performance of liquid ring pump was established in this study, to solve the problem that the theoretical models deviated from the actual performance in operating cycle. With the major geometric parameters and operating conditions of a liquid ring pump, the performance parameters such as the actual capacity for suction and discharge, shaft power, and global efficiency can be conveniently predicted by the proposed theoretical model, without the limitation of empiric range, performance data, or the detailed 3D geometry of pumps. The proposed theoretical model was verified by experimental performances of liquid ring pumps and could provide a feasible tool for the application of liquid ring pump.
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Velikanov, N. L., V. A. Naumov, and S. I. Koryagin. "Pumping of Liquids Using Liquid-Ring Pumps." Proceedings of Higher Educational Institutions. Маchine Building, no. 08 (725) (August 2020): 51–59. http://dx.doi.org/10.18698/0536-1044-2020-8-51-59.

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The paper examines modelling of the pumping stages when using liquid-ring pumps, for example, in power plants and technological devices. It is important to determine the characteristics of various processes involved in liquid pumping using vacuum because the accuracy of predicting how objects move in such flows cannot be improved without solving the problems related to the calculation of hydraulic and power characteristics of the pumping unit in the network. Cubic spline functions were used as approximating functions when calculating the performance characteristics of a liquid-ring vacuum pump. The dynamics of changes in the pressure in the working vessel during operation of an ELRS-5 pump was considered for different values of the leakage coefficient. Solutions of the Cauchy problem were obtained using the numerical method. The paper presents the results of calculating the dynamics of the process of liquid pumping into the working vessel at different values of the vacuum creation time. As the time increases, the liquid flow rate quickly reaches its maximum value, and then falls with a decrease in the pressure drop. The higher the maximum flow rate, the longer the time.
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Fujita, Masaru, Susumu Ishii, Satoshi Yamazaki, and Tatsuro Yoshinaga. "The Visualization of Liquid Ring a Single Action Type Liquid Ring Pump." Journal of the Visualization Society of Japan 23, Supplement2 (2003): 91–94. http://dx.doi.org/10.3154/jvs.23.supplement2_91.

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FUJITA, Masaru, Susumu ISHII, Satoshi YAMAZAKI, and Tatsuro YOSINAGA. "The Visualization of Liquid Ring a Single Action Type Liquid Ring Pump." Proceedings of Conference of Tohoku Branch 2003.38 (2003): 40–41. http://dx.doi.org/10.1299/jsmeth.2003.38.40.

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Han, Jian Yong, and Guo Jing Chen. "Numerical Simulation Analysis of Centrifugal Pump Floating Ring Seal." Advanced Materials Research 317-319 (August 2011): 2148–51. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2148.

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According to the studying on the force analysis of floating ring of centrifugal pump, the paper think that floating ring stress will change with the change of centrifugal pump’ s condition. Using fluent software, the floating ring seal was simulated and analyzed. Results show that the liquid force acted on the floating ring is nonuniform and asymmetrical as wedging effect, and that section maximum pressure is not lies in the smallest clearance place, but in the wedge area where liquid flows to the minimum clearance, because the effect of Leak resistance is better in high pressure than low pressure. The leakage decreases and liquid resistance increases with the increases of RPM. The leakage increases with the increases of differential pressure in sealing ring sides and eccentricity. Pressure distribution within the seal clearance is not uniform with the increases of eccentricity.
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Kirk, R. G. "Transient Response of Floating Ring Liquid Seals." Journal of Tribology 110, no. 3 (July 1, 1988): 572–77. http://dx.doi.org/10.1115/1.3261688.

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The design and analysis of pressure balanced seals are important to the designers and users of turbomachinery which require floating element seals. The design objective for compressor seals differs from that of the engineered pump seal but the common factor includes the ability to predict the dynamic response of the floating ring seal relative to the rotor shaft. Steady-state calculations can be used to study possible operating conditions for compressor designs, but they do not include accurate account of rotor shaft response and ring spin torque. In addition, engineered pump seal applications are such that the ring is expected to track shaft movement during start-up and shut-down transients when reduced pressures and leakage produce laminar flow sealing conditions. The analysis presented in this paper gives the designer the ability to evaluate seal ring dynamic transient response, including friction stick-slip on the axial sealing face and the ring spin torque interaction with the antirotation element. The analysis results presented in this paper were obtained from a personal computer program written specifically for seal transient analysis.
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P, Ravi Kumar. "Experimental Analysis of Liquid Ring Vacuum Pump Cavitation Reduction." International Journal for Research in Applied Science and Engineering Technology 7, no. 11 (November 30, 2019): 723–26. http://dx.doi.org/10.22214/ijraset.2019.11119.

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YOSHINAGA, Tatsuro, and Masaru FUJITA. "A Method of the Shape Calculation of Liquid Ring inside a Single Action Type Liquid Ring Pump." Proceedings of Yamanashi District Conference 2002 (2002): 183–84. http://dx.doi.org/10.1299/jsmeyamanashi.2002.183.

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Olšiak, Róbert, Zoltán Fuszko, and Zoltán Csuka. "Reduction of the suction pressure of a liquid ring vacuum pump with a supersonic gas ejector." MATEC Web of Conferences 168 (2018): 03002. http://dx.doi.org/10.1051/matecconf/201816803002.

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A supersonic gas ejector in conjunction with a liquid ring vacuum pump is used for creating and maintaining vacuum in a chamber for technological purposes. In this paper the authors submit an overview about the problematics of suction pressure reduction with a supersonic gas ejector used as a pre-stage of a liquid ring vacuum pump. This system has also the function of a cavitation protection due to the higher pressure present at the suction throat of the vacuum pump. A part of this paper is devoted to the governing equations used at the definition of the flow through an ejector. The experimental studies are then carried out in or own laboratory for verification purposes.
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Dissertations / Theses on the topic "Liquid ring pump"

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Rashtchian, Davud. "Performance of an industrial scale condensor and a liquid ring pump operations at reduced pressure." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488163.

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Experimental data are presented on condensation of steam from mixtures with air and on condensation of hydrocarbon vapour (methylcyclohexane-toluene) mixtures at reduced pressure in an 'E' shell exchanger of standard design and industrial scale. The work is principally concerned with measurements and predictions of pressure drop. However, thermal performance is also considered.
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Karlsen-Davies, Nilla. "Computational and experimental analysis of the effects of manufacturing tolerances on the performance of a regenerative liquid ring pump." Thesis, Lancaster University, 2017. http://eprints.lancs.ac.uk/126403/.

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The regenerative liquid ring (RLR) pump is a type of rotodynamic pump which combines the mechanical impulses of the impeller with centrifugal force. The head is increased through recirculation, or regeneration, of the fluid in the impeller blades. The design of the regenerative machine has evolved over many decades and improvements have been made in the design, particularly in the shape and number of impeller blades. However, few publications exist on other design aspects such as the radial and axial clearances between the impeller and the casing, and more crucially most researchers tend to investigate these elements in isolation. This highlights the key driver and novelty of this current research, which applies modern Computational Fluid Dynamics (CFD) tools to systematically assess the effects on pump performance over a large range of impeller-casing clearance parameters and understand their operational behaviour. The sizes of the clearances are dictated by the manufacturer’s drawing tolerances on critical pump components. The results of the parametric clearance analysis showed that there could be a potential variation in head performance by as much as 25%. Furthermore, it highlighted the need to experimentally test a number of pumps within a representative tolerance range. Three test pumps were therefore manufactured and tested. A discrepancy between the CFD and experimental results was observed but the experimental results confirmed that variations in clearances have an impact on the performance, particularly on the developed head. This was more noticeable at higher operational speeds where the pressure differential varied by as much as 19%. A one-way Fluid-Structure Interaction analysis of the three test impellers was carried out to shed some light on the operational behaviour of the pumps and the effects on the clearances due to non-uniform loading by importing pressure profiles from the corresponding CFD simulations. Assessing the deformation against the computational and experimental pressure, the results indicate that the maximum allowable radial design clearance should be reduced by 35%. Furthermore, with this radial design tolerance the magnitudes of the drive end and non-drive end clearances have a lower impact on the performance. The RLR pump is unique and requires further comparison studies between experimental testing and computational analysis.
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Dhollande, Dominique. "Amélioration du rendement énergétique d'une série de pompes à anneau liquide." Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/f5e5f57e-5bc9-4af1-80fa-a93cb0d6c8b6.

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Les pompes à anneau liquide sont des machines de compression volumétriques, principalement utilisées en pompe à vide et qui aspirent des gaz jusqu'à des pressions absolues de 30 mbar. Ces pompes possèdent de nombreux avantages mais un faible rendement global par rapport à l'isotherme qui peut descendre jusqu'à 10% et une consommation en eau importante. L'étude qui a été réalisée a permis d'améliorer ces deux derniers points. Apres une modélisation de la puissance absorbée par la méthode des pertes séparées, des axes de recherche ont pu être déterminés. Différentes solutions technologiques ont été testées sur un banc d'essais énergétique. Ce banc équipé d'une maquette de la série des pompes étudiées permet la mesure des caractéristiques de fonctionnement (pressions, débits, puissance, température) sur une large plage de pression et de vitesse de rotation. Une analyse dimensionnelle basée sur le modèle des turbomachines a permis de définir un jeu de coefficients sans dimensions permettant la transposition des résultats obtenus sur l'ensemble de la gamme des machines étudiées.
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Hayadar, B. "The process design of liquid ring pumps for vacuum duties." Thesis, University of Manchester, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488225.

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(8090501), Ashutosh Pandey. "Computational Analyses of the Unsteady, Three Dimensional Multiphase Flow in a Liquid Ring Vacuum Pump." Thesis, 2019.

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Vacuum is needed in many applications and, there are many types of pumps that can provide the vacuum level needed. One widely used pump is the liquid-ring vacuum pump, which does not involve any solid-solid contacts at interfaces where moving and stationary parts meet. Though liquid-ring vacuum pumps are efficient and robust, manufacturers have aggressive goals on improving efficiency, performance, and range of operations.
In this research, time-accurate computational fluid dynamic (CFD) analyses were performed to study the flow mechanisms in a liquid-ring vacuum pump to understand how it works and how the design can be improved. Based on the understanding gained, a physics based reduced order model was developed for preliminary design of the liquid ring vacuum pumps.
In the CFD analyses, the liquid (water) was modeled as incompressible, the gas (air) as an ideal gas, and turbulence by the shear-stress transport model. The gas-liquid interface was resolved by using the volume-of-fluid method, and rotation of the impeller was enabled by using a sliding mesh. Parameters examined include the suction pressure (75, 300, and 600 Torr) and the impeller's rotational speed (1150, 1450 and 1750 rpm) with the temperature of the gas at the inlet of the suction chamber kept at 300 K and the pressure at the outlet of the exhaust chamber kept at one atmosphere. The CFD solutions generated were verified via a grid sensitivity study and validated by comparing with experimental data. When compared with experiments, results obtained for the flow rate of the gas ingested by the pump had relative errors less than 6\% and results obtained for the power consumed by the pump had relative errors less than 13\%.
Results obtained show the shape of the liquid ring to play a dominant role in creating the expansion ratio or the vacuum needed to draw air into the pump through the suction port and the compression ratio needed to expel the air through the discharge ports. Results were generated to show how centrifugal force from rotation and how acceleration/deceleration from the difference in pressure at the pump's inlet and outlet along with the eccentricity of the impeller relative to the pump's housing affect the shape of the liquid ring. Results were also generated to show how the rotational speed of the impeller and the pressure at the suction port affect the nature of the gas and liquid flow in the pump and the pump’s effectiveness in creating a vacuum.
With the knowledge gained from the CFD study, a physics-based reduced-order model was developed to predict air ingested and power consumed by the pump as well as the liquid ring shape and pressure of the gas and liquid in the pump as a function of design and operating parameters. This model was developed by recognising and demonstrating that the amount of air ingested and power consumed by the pump is strongly dependent on the shape and location of the liquid ring surface. The flow rates of the gas ingested by the pump and the power consumed by the pump predicted by the model were compared with experimental data and relative errors were less than 12\% and 17\% respectively.
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Books on the topic "Liquid ring pump"

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Gedge, P. J. Possible applications of liquid ring devices as separational units and the prediction of ring shape in a liquid ring pump with a non-cylindrical casing. Manchester: UMIST, 1990.

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Niakousari, M. New applications of liquid ring pumps. Manchester: UMIST, 1990.

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Hayadar, B. The prediction of ring shape due to the performance of liquid ring pumps. Manchester: UMIST, 1989.

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Liquid ring vacuum pumps and compressors: Applications and principles of operation. Houston: Gulf Pub. Co., Book Division, 1988.

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Hayadar, B. The process design of liquid ring pumps for vacuum duties. Manchester: UMIST, 1992.

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Great Britain. Energy Efficiency Office. and Harwell Laboratory. Energy Technology Support Unit., eds. Energy efficient liquid ring vacuum pump installations in the paper industry. Harwell: ETSU, 1993.

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Bannwarth, Helmut. Liquid Ring Vacuum Pumps, Compressors and Systems: Conventional and Hermetic Design. Wiley & Sons, Incorporated, John, 2006.

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Bannwarth, Helmut. Liquid Ring Vacuum Pumps, Compressors and Systems: Conventional and Hermetic Design. Wiley-VCH Verlag GmbH, 2005.

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Bannwarth, Helmut. Liquid Ring Vacuum Pumps, Compressors and Systems: Conventional and Hermetic Design. Wiley-VCH, 2005.

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Book chapters on the topic "Liquid ring pump"

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Hähre, Pierre. "Liquid Ring Vacuum Pumps in Industrial Process Applications." In Vacuum Technology in the Chemical Industry, 35–80. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527653898.ch3.

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"Components for Pump Units with Liquid Ring Vacuum Pumps and Compressors." In Liquid Ring Vacuum Pumps, Compressors and Systems, 289–329. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch5.

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Meyer-Pittroff, R., and Th Hackensellner. "Experimental Development of a High Temperature Heat Pump Using a Liquid Ring Compressor." In Heat Pumps, 615–25. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-08-040193-5.50071-7.

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"Liquid Ring Vacuum Pumps and Liquid Ring Compressors." In Liquid Ring Vacuum Pumps, Compressors and Systems, 157–238. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch3.

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"Reciprocating and Liquid Ring Vacuum Pumps* *From “Reciprocating Pumps,” Chemical Engineering, Sept. 21, 1981 by T. L. Henshaw, Union Pump Co. Adapted by permission of the author." In Practical Machinery Management for Process Plants, 118–41. Elsevier, 1997. http://dx.doi.org/10.1016/s1874-6942(97)80005-3.

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"Design of Vacuum Pumps and Pipework." In Liquid Ring Vacuum Pumps, Compressors and Systems, 331–50. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch6.

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"Vacuum and Compressor Plants with Liquid Ring Machines." In Liquid Ring Vacuum Pumps, Compressors and Systems, 239–87. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch4.

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"Gas Physics and Vacuum Technology." In Liquid Ring Vacuum Pumps, Compressors and Systems, 1–109. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch1.

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"Appendix." In Liquid Ring Vacuum Pumps, Compressors and Systems, 423–86. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch10.

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"Machines for Vacuum Generation." In Liquid Ring Vacuum Pumps, Compressors and Systems, 111–55. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605886.ch2.

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Conference papers on the topic "Liquid ring pump"

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"Vacuum Evaporator Design Liquid Ring Vacuum Pump Method." In International Seminar of Research Month Science and Technology in Publication, Implementation and Commercialization. Galaxy Science, 2018. http://dx.doi.org/10.11594/nstp.2018.0133.

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Pardeshi, Irsha, Ashutosh Pandey, and Tom I.-P. Shih. "A Reduced-Order Model for Predicting the Performance of a Liquid-Ring Vacuum Pump." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86710.

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Vacuum and low pressures are needed in many applications, and the liquid-ring vacuum pump, which does not have any solid-solid contacts between moving and stationary parts, is widely used because of its low operational cost and long service life. Though progress has been made in advancing this pump, industry still has aggressive goals on improving its efficiency and performance. In this study, a reduced-order model was developed to predict the ability of liquid-ring pumps to ingest air and thereby create lower pressure as a function of pump design and operating parameters. The model developed is semi-empirical — constructed by first analyzing available experimental data to extract features and trends and then encapsulating them into a model through appropriate dimensionless parameters. This model by being in closed form shows the functional relationship between the pump’s design and operating parameters and its ability to ingest air and create a vacuum. To make predictions, this model only requires the following inputs: suction pressure, impeller’s rotational speed, and a few dimensions of the pump. The model developed was assessed by using it to predict the ability of the pump to ingest air for a wide range of suction pressures (cavitation pressure to 760 torr), rotor speeds (up to 1,750 rpm), and dimensions of the pump (radius and span of the impeller blade, hub radius) and then comparing predictions with experimental data not used in the creation of the model. The model developed was found to be accurate within 11% of the experimental data.
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Mao-xi, ZHENG, ZHU Sheng-guang, ZHANG xian-feng, ZHANG Li, and LIAO Dan. "Experimental and computational analysis for air-ejector of liquid ring vacuum pump." In 2019 International Conference on Advanced Mechatronic Systems (ICAMechS). IEEE, 2019. http://dx.doi.org/10.1109/icamechs.2019.8861637.

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Radle, Manoj, and Biswadip Shome. "Cavitation Prediction in Liquid Ring Pump for Aircraft Fuel Systems by CFD Approach." In SAE 2013 AeroTech Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2013. http://dx.doi.org/10.4271/2013-01-2238.

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Ding, Hui, Yu Jiang, Hao Wu, and Jian Wang. "Two Phase Flow Simulation of Water Ring Vacuum Pump Using VOF Model." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-33654.

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Due to the complex two phase flow, CFD simulation of liquid ring pump used to be extremely challenging. Using a recently developed Volume of Fluid (VOF) two phase flow model, this paper presents a 3D transient CFD model for a water ring vacuum pump. The test simulations show that the new VOF model is very robust and can catch most of the important physics when applied to a industrial water ring vacuum pump. Model formulation and problem setup will be presented in detail in the paper. Important issues that could affect the simulation results will be discussed. Water ring pump flow field characteristics revealed from simulation results will be summarized with explanation. And finally the simulation results will be compared with experiment test data.
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Lu, Xueliang, Luis San Andrés, and Tingcheng Wu. "Leakage and Force Coefficients of a Grooved Wet (Bubbly Liquid) Seal for Multiphase Pumps and Comparisons With Prior Test Results for a Three Wave Seal." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90254.

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Abstract In the subsea oil and gas industry, multiphase pumps and wet gas compressors are engineered choices saving transportation and separation facility costs. In these machines, seals handling multiple phase components must be able to operate without affecting the system efficiency and its dynamic stability. This paper, extending prior work conducted with uniform clearance and wavy surface annular seals, presents measurements of leakage and dynamic force coefficients in a grooved seal whose dimensions are scaled from an impeller wear ring seal in a boiler feed pump. The 14-grooves seal has diameter D = 127 mm, length L = 0.34 D, and clearance c = 0.211 mm; each groove has shallow depth dg ∼2.6 c and length Lg ∼ 3.4% L. At a shaft speed of 3.5 krpm (surface speed = 23.3 m/s), a mixture of air in ISO VG 10 oil with inlet gas volume fraction (GVF) ranging from 0 (just oil) to 0.7 (mostly air) lubricates the seal. The pressure ratio (inlet/exit) is 2.9. The flow is laminar since the liquid is viscous and the pressure drop is low. The measured mixture mass flow decreases continuously with an increase in inlet GVF. The seal stiffnesses (direct K and cross coupled k), added mass (M), and direct damping (C) coefficients are constant when the supplied mixture is low in gas content, GVF ≤ 0.1. As the gas content increases, 0.2 ≤ GVF ≤ 0.5, the seal direct dynamic stiffness becomes nil with an increase in excitation frequency, whereas k and C reduce steadily with GVF. In general, for GVF ≤ 0.5 the direct damping is invariant with frequency; variations appearing for GVF = 0.7. Compared against a three wave annular seal, the grooved seal offers much lower force coefficients, in particular the viscous damping. Thus, for laminar flow operation (heavy oil) with a low pressure drop as in a wear ring seal, a three wave seal is recommended as it also offers a significant centering stiffness.
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San Andrés, Luis, Jing Yang, and Xueliang Lu. "On the Leakage, Torque and Dynamic Force Coefficients of an Air in Oil (Wet) Annular Seal: A CFD Analysis Anchored to Test Data." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77140.

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Subsea pumps and compressors must withstand multi-phase flows whose gas volume fraction (GVF) or liquid volume fraction (LVF) varies over a wide range. Gas or liquid content as a dispersed phase in the primary stream affects the leakage, drag torque, and dynamic forced performance of secondary flow components, namely seals, thus affecting the process efficiency and mechanical reliability of pumping/compressing systems, in particular during transient events with sudden changes in gas (or liquid) content. This paper, complementing a parallel experimental program, presents a computational fluid dynamics (CFD) analysis to predict the leakage, drag power and dynamic force coefficients of a smooth surface, uniform clearance annular seal supplied with an air in oil mixture whose inlet GVF varies discretely from 0.0 to 0.9, i.e., from a pure liquid stream to a nearly all gas content mixture. The test seal has uniform radial clearance Cr = 0.203 mm, diameter D = 127 mm, and length L = 0.36 D. The tests were conducted with an inlet pressure/exit pressure ratio equal to 2.5 and a rotor surface speed of 23.3 m/s (3.5 krpm), similar to conditions in a pump neck wear ring seal. The CFD two-phase flow model, first to be anchored to test data, uses an Euler-Euler formulation and delivers information on the precise evolution of the GVF and the gas and liquid streams’ velocity fields. Recreating the test data, the CFD seal mass leakage and drag power decrease steadily as the GVF increases. A multiple-frequency shaft whirl orbit method aids in the calculation of seal reaction force components, and from which dynamic force coefficients, frequency dependent, follow. For operation with a pure liquid, the CFD results and test data produce a constant cross-coupled stiffness, damping, and added mass coefficients, while also verifying predictive formulas typical of a laminar flow. The injection of air in the oil stream, small or large in gas volume, immediately produces force coefficients that are frequency dependent; in particular the direct dynamic stiffness which hardens with excitation frequency. The effect is most remarkable for small GVFs, as low as 0.2. The seal test direct damping and cross-coupled dynamic stiffness continuously drop with an increase in GVF. CFD predictions, along with results from a bulk-flow model (BFM), reproduce the test force coefficients with great fidelity. Incidentally, early engineering practice points out to air injection as a remedy to cure persistent (self-excited) vibration problems in vertical pumps, submersible and large size hydraulic. Presently, the model predictions, supported by the test data, demonstrate that even a small content of gas in the liquid stream significantly raises the seal direct stiffness, thus displacing the system critical speed away to safety. The sound speed of a gas in liquid mixture is a small fraction of those speeds for either the pure oil or the gas, hence amplifying the fluid compressibility that produces the stiffness hardening. The CFD model and a dedicated test rig, predictions and test data complementing each other, enable engineered seals for extreme applications.
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Yan, Qingdong, Yuanyuan An, and Wei Wei. "Research on Fluid Flow Stability With Baffles of Different Size in a Hydrodynamic Coupling During Partially Liquid-Filled Operating Conditions." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-65111.

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The hydrodynamic coupling is a power transmission device dependent on the liquid medium momentum change with the advantage of slow shock, isolation of torsional vibration, start light load and overload protection, which is applied in engineering, mining, construction, lifting the transport machinery, et al[1]. The hydrodynamic coupling without inner ring usually works in partially liquid-filled operating conditions, when the flow state changes suddenly with the rotating speed ratio changing. This may lead to unstable gas-liquid two-phase flow in a hydrodynamic coupling in a certain ratio range. To improve the stability of two-phase flow, a baffle is set inside the circulatory circle of a hydrodynamic coupling. The baffle blocks part of the flow area between two wheels in the hydrodynamic coupling. The size of baffle plays an important role on the effect for improving the flow stability. To investigate the influence of the baffle to the internal flow stability, the two-phase flow (liquid-filling rate is 80%) in hydrodynamic couplings with baffles in different sizes and without baffles were studied by Computational Fluid Dynamics (CFD) numerical simulation with the rotating speed of pump at constant 2200 r/min and rotating speed of turbine changing from 0 to 2200r/min. The corresponding distributions of streamlines and characteristics curves were obtained. Through the analysis of turbine torque and efficiency, it is verified that the baffle could improve the flow stability, and the different distributions of streamline could explain the reason. In addition, optimal range of baffle size c = 30% ∼ 40% is obtained by analyzing the simulation results. This will provide a basis for the improvement of design in the hydrodynamic coupling.
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9

Fleder, Sebastian, Frank Hassert, Martin Böhle, and Beate Zientek-Strietz. "Influence of Gas-Liquid Multiphase-Flow on Acoustic Behavior and Performance of Side Channel Pumps." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69094.

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Side-channel pumps (SCP) are a niche product, able to deliver relatively high heads at low flow rates, which corresponds in a low specific speed. They are closing the gap between classical radial centrifugal pumps and positive displacement pumps, combining the advantages of both without having all the negative effects. The hydraulic efficiency of SCP seems low at first sight. But classical centrifugal pumps are often working under part load conditions, when working at this volume flow and specific speed range, which means they are not able to perform at their BEP. This reduces the efficiency of centrifugal pumps and creates a major benefit of SCP, which are able to work in their BEP. The acoustic behavior and the characteristic pulsations and vibrations of a side channel pump are measured with various measurement methods, such as vibrometry, sound level measurement and sound cartography using an acoustic camera. The characteristic vibrations are shown and compared to the characteristic pressure-pulsations of the working fluid. The two-phase liquid-gas flow has, beside the effects on the characteristic curves such as head drop and efficiency reduction, many side effects on the behavior of the pump. This could be acoustical and vibrational effects. When gas is present in the working fluid, the emitted noise from the pump reduces significantly. This effect is shown by sound intensity measurements as well as measurements with an acoustic camera and laser vibrometry and compared to the results for single-phase flow. The maximum amount of gas for the test pump is measured at different rotational speeds. Some theories to improve the maximum amount of gas in the working fluid are presented and the modifications are tested on a test rig. These modifications consist of the idea that a pump without NPSH-impeller could process higher amounts of gas in multiphase-flow conditions. An additional gas outlet hole is added to the pump to allow a phase separation and therefore a better two-phase flow handling of the pump. The effect of these changes on the maximum amount of gas are presented and evaluated.
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10

Ippoliti, Laurent, Olivier Berten, and Patrick Hendrick. "Experimental Study on Two-Phase Flows in Scavenge Pump for Aircraft Engine Oil System." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56062.

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This work is the continuation of previous studies on gerotor-type pump performance in turbofan engine oil systems operated as feed pumps in single-phase liquid oil. The focus here is on scavenge pumps whose role is to pump a mix of air and oil. This paper is intended to present the modifications that had to be made on the test rig from the previous studies to model a scavenge system and more generally to add two-phase flow capacity. The paper presents results from the first successful experimental test campaign. The aim is to characterize the performance of a typical pump, already tested as a feed pump, in the scavenge system. The critical performance parameter studied is the volumetric efficiency which determines the size and weight of the pump. This paper ends by drawing conclusions on the rig and the results, and linking them with the previous single-phase flows studies.
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