Relevant bibliographies by topics / Vertical tube baffle / Journal articles
To see the other types of publications on this topic, follow the link: Vertical tube baffle.

Journal articles on the topic 'Vertical tube baffle'

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

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 24 journal articles for your research on the topic 'Vertical tube baffle.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Greenwood, Andrew, J. Christian Dupuis, Anton Kepic, and Milovan Urosevic. "Experimental testing of semirigid corrugated baffles for the suppression of tube waves in vertical seismic profile data." GEOPHYSICS 84, no. 3 (May 1, 2019): D131—D149. http://dx.doi.org/10.1190/geo2017-0636.1.

Full text
Abstract:
Multichannel borehole hydrophone strings are a low-cost, low-risk, alternative to borehole clamping geophones. Vertical seismic profile (VSP) data collected with hydrophones, however, suffer from high-amplitude coherent tube-wave noise. This reduces the usable data to the first arrivals and traveltimes for check-shot surveys. To significantly reduce tube-wave noise from VSP data acquired with hydrophones, we have designed and tested a novel tube-wave attenuation baffle. The effectiveness of the baffle was first verified in a laboratory-scale experiment and then in a borehole drilled into a hardrock environment. The laboratory experiments tested the performance of four different baffle topologies, whereby the best performing topology was the semirigid corrugated pipe baffle. This design reduced the amplitude of the tube wave with more than 40 dB and was logistically easy to deploy. The field experiment investigated the effectiveness of three different semirigid corrugated pipe baffle topologies in a PQ (123 mm) diamond drillhole in Western Australia. Here, we found that the semirigid corrugated pipe baffle was effective in disrupting tube-wave propagation. The 100 mm diameter baffle achieved an impressive 60 dB of tube-wave attenuation, whereas the 50 mm baffle had a modest attenuation of 10–15 dB. This suggests that the performance of this new type of baffle is best when the diameter of the baffle is closely matched to the diameter of the borehole. The results of these experiments have significant implications because hydrophone arrays with a large number of receivers are comparatively inexpensive and simpler to deploy than borehole geophone counterparts. The development of hydrophone arrays that are free of interfering borehole modes could allow VSPs to be acquired in situations in which seismic-polarity information is not required and could help VSP gain traction in cases in which the cost of acquisition has precluded its use until now.
APA, Harvard, Vancouver, ISO, and other styles
2

Susmiati, Yuana, Bambang Purwantana, Nursigit Bintoro, and Sri Rahayoe. "Kinerja Internal Reboiler Tipe Vertical Tubular Baffle pada Proses Distilasi Etanol secara Batch." Jurnal Rekayasa Proses 15, no. 1 (June 30, 2021): 59. http://dx.doi.org/10.22146/jrekpros.65483.

Full text
Abstract:
The performance of ethanol distillation is determined by the type of reboiler used in the distillation column. This study aims to determine the effect of differences in diameter and height of internal reboiler tubes, as well as feed content on ethanol distillate concentration and distillation yield. The research was conducted on a batch ethanol distillation process using a rectified distillation device with an internal vertical tubular baffle reboiler using different diameters and tube height, namely 1.5, 1, and 0.5 inches of diameter, and 8, 6, and 4 cm of tube heights. Materials or feeds in this study were ethanol solutions with levels of 10%, 20%, and 30% v/v. The results showed that the highest ethanol distillate content of 97.17% v/v (average) was achieved in the distillation process using an internal reboiler with a diameter of 0.5”, a tube height of 8 cm, and a feed content of 10%. Geometry affected the heat transfer process in the internal reboiler of a distillation device so that it affected the distillation results.Keywords: distillation; ethanol; internal reboiler: performanceA B S T R A KKinerja alat distilasi etanol ditentukan oleh jenis reboiler yang digunakan pada kolom distilasi. Penelitian ini bertujuan untuk menentukan pengaruh perbedaan diameter dan tinggi tabung internal reboiler, serta kadar umpan terhadap kadar etanol distilat dan rendemen distilasi. Penelitian dilakukan pada proses distilasi etanol secara batch menggunakan alat distilasi rektifikasi dengan internal reboiler jenis Vertical Tubular Baffle yang berbeda ukuran diameter dan tinggi tabungnya, yaitu diameter 1,5, 1 dan 0,5 inci, serta tinggi tabung 8, 6 dan 4 cm. Bahan atau umpan pada penelitian ini adalah larutan etanol berkadar 10%, 20% dan 30% v/v. Hasil penelitian didapatkan kadar etanol distilat yang paling tinggi dengan kadar rata-rata 97,17% v/v dicapai pada proses distilasi dengan internal reboiler berukuran diameter 0,5 inci, dan tinggi tabung 8 cm dan kadar umpan 10%. Geometri berpengaruh pada proses perpindahan panas di dalam internal reboiler suatu alat distilasi sehingga berpengaruh terhadap hasil distilasi.Kata kunci: distilasi; etanol; internal reboiler; kinerja
APA, Harvard, Vancouver, ISO, and other styles
3

Li, Dan Dan, and Zhi Jian Fan. "Design for Electrolyte Sedimentation Basin Based on COMSOL." Advanced Materials Research 411 (November 2011): 299–302. http://dx.doi.org/10.4028/www.scientific.net/amr.411.299.

Full text
Abstract:
The long spiral tube with its deep rifle groove make a long duration for Electrochemical Machining (ECM) and mass of floccule precipitate, esulting in bottleneck to maintain cleanliness of electrolyte in sedimentation basin at machining. The design scheme of duplex vertical flow electrolyte basin was proposed. The surface hydraulic power, available cubage, flooding area, sludge blanket level (SBH) and sludge tank height were calculated in terms of the electrical current, sinking speed of Fe(OH)3, flux of electrolyte. The streamline in the basin were simulated by COMSOL based elementary draft. The flow speed at intake of sludge blanket and the exit of clarified were analyzed with diameter of cone-meatus of center tube being altered and the space between it and baffle-board shifted, and the sedimentation basin is optimized.
APA, Harvard, Vancouver, ISO, and other styles
4

Milligan, Paul A., James W. Rector, and Robert W. Bainer. "Hydrophone VSP imaging at a shallow site." GEOPHYSICS 62, no. 3 (May 1997): 842–52. http://dx.doi.org/10.1190/1.1444193.

Full text
Abstract:
We evaluated the capabilities of vertical seismic profiling (VSP) for imaging the complex heterogeneous unconsolidated sedimentary structures at a shallow site. We deployed a 24‐level hydrophone array with 0.5-m level spacing down a preexisting poly vinyl chloride (PVC) cased well. Data acquisition time was quick. Only 15 multioffset shot points using a hammer‐on‐plate source were needed to acquire reflection data between the water table at 3 m and the bedrock at 35 m to produce a depth section image. This image extended 9 m from the receiver well, yielding resolutions between fresh‐water‐bearing sands and impermeable muds and clays of better than 1 m. Depth accuracy of the image was confirmed by good correlation with cone penetrometer logs. We used conventional wavefield separation and VSP-CDP mapping techniques to image the data. Tube waves, created by seismic arrivals at cross‐sectional area changes in the borehole fluid column, were the primary source of coherent noise in the data. The tube‐wave arrival structure was complicated by the hydrophone array, which generated and scattered tube waves at each hydrophone pod. To combat the tube wave interference, we inserted closed‐cell‐foam baffles between elements. The baffles attenuated and slowed the tube waves, and reduced generation and scattering. A comparison between unbaffled and baffled VSP data showed that baffling increased the maximum useful frequency from 300 Hz to over 900 Hz. By contrast, surface shot data recorded at the same site, using buried 40-Hz vertical geophones, exhibited useful frequencies of less than 250 Hz. In addition, coherent noise in surface shot records caused by air waves and first arrivals made it very difficult to identify shallow reflections above 25 m. Reflections from depths as shallow as 10 m were easy to identify in the baffled VSP data.
APA, Harvard, Vancouver, ISO, and other styles
5

Lin, Shu Biao, Xin Chun Cai, and Yan Jin. "Study on Reasons of Frequent Outfire in a Boiler with Horizontal Concentrated Burners." Advanced Materials Research 354-355 (October 2011): 350–54. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.350.

Full text
Abstract:
This paper discusses the problems of instable combustion, serious slag, outfire in boilers with horizontal concentrated boiler, taking a 410t/h boiler as the sample. Through experimental researches on different adjusting characteristics of horizontal concentrated burners, it is found that the coal air mixture has different characteristics in velocity and concentration when the baffles are respectively left in the centrifugal or centripetal side of the bent pipes, and that the baffles wear pattern also depends on individual installation location. During many cold and hot commissioning tests, the effective height of baffles is regulated and the original refractory belts are replaced to vertical evenly spaced bare-tube wall. After taking the above measures, the significant problems in the boiler are settled and the economics and safety operation performance is improved considerably. Thus the paper can offer certain references for other boilers with horizontal concentrated burners.
APA, Harvard, Vancouver, ISO, and other styles
6

Hošťálek, Miloslav, and Ivan Fořt. "Description of vortex turbulent flow of mixed liquid." Collection of Czechoslovak Chemical Communications 50, no. 4 (1985): 930–46. http://dx.doi.org/10.1135/cccc19850930.

Full text
Abstract:
The article describes a theoretical model of two-dimensional flow of a homogeneous liquid in a cylindrical space delimited by the shell of the mixing tank with a conical bottom, radial baffles and a high-speed axial impeller rotating in a cylindrical draft-tube. By means of the analytical solution of vortex flow equation the mean time flow of turbulent liquid in the vertical cross section of the vessel may be described in the form of Stokes stream function or mean velocity components. The results of theoretical description of the flow are in a good agreement with the experimental values measured by a Pitot direction tube and a hot film anemometer.
APA, Harvard, Vancouver, ISO, and other styles
7

Rosa, Vitor da Silva, Thiago Cesar de Souza Pinto, Aldo Ramos Santos, Carlos Alberto Amaral Moino, Karina Tamião, Luiz Renato Bastos Lia, Elias Basile Tambourgi, Marcílio Dias Lopes, Juliana Tófano de Campos Leite Toneli, and Deovaldo de Mores Júnior. "External Coefficient of Heat Transfer by Convection in Mixed Vessels Using Vertical Tube Baffles." Industrial & Engineering Chemistry Research 52, no. 6 (February 4, 2013): 2434–38. http://dx.doi.org/10.1021/ie301841q.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

da Silva Rosa, Vitor, Marlene Silva de Moraes, Juliana Tófano de Campos Leite Toneli, and Deovaldo de Moraes Júnior. "External Heat Transfer Coefficient in Agitated Vessels Using a Radial Impeller and Vertical Tube Baffles." Industrial & Engineering Chemistry Research 53, no. 35 (August 22, 2014): 13797–803. http://dx.doi.org/10.1021/ie5008618.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Vazquez-Ramirez, E. E., J. M. Riesco-Avila, and G. T. Polley. "Two-phase flow and heat transfer in horizontal tube bundles fitted with baffles of vertical cut." Applied Thermal Engineering 50, no. 1 (January 2013): 1274–79. http://dx.doi.org/10.1016/j.applthermaleng.2012.08.053.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

da Silva Rosa, Vitor, Daniel Lopes Muiños Torneiros, Henrique Weiss de Albuquerque Maranhão, Marlene Silva de Moraes, Maria Elena Santos Taqueda, José Luis de Paiva, Aldo Ramos Santos, and Deovaldo de Moraes Júnior. "Heat transfer and power consumption of Newtonian and non-Newtonian liquids in stirred tanks with vertical tube baffles." Applied Thermal Engineering 176 (July 2020): 115355. http://dx.doi.org/10.1016/j.applthermaleng.2020.115355.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Youssef, Ahmed A., Muthanna H. Al-Dahhan, and Milorad P. Dudukovic. "Bubble Columns with Internals: A Review." International Journal of Chemical Reactor Engineering 11, no. 1 (June 18, 2013): 169–223. http://dx.doi.org/10.1515/ijcre-2012-0023.

Full text
Abstract:
Abstract Most industrial bubble column reactors require the utilization of internal structures for heat transfer and/or for controlling the flow structures and back mixing in the system. The internals denote all types of innards added to a bubble column, such as perforated plates, baffles, vibrating helical springs, mixers, and heat exchanger tubes. In commercial scale bubble columns, instrumentation probes, down-comers, and risers with heat exchangers are all considered. This review presents the state-of-knowledge of bubble columns with internals. It starts with an introduction. The second section discusses the horizontal internals, and the following section examines the studies involving vertical internals.
APA, Harvard, Vancouver, ISO, and other styles
12

Lu, Xiao, Chao Yang Wang, Gang Wei, and Shou Wei Yang. "Study of Cold-State Aerodynamic Field Test on the Outlet of 2150t/h Supercritical Once-Through Boiler." Applied Mechanics and Materials 448-453 (October 2013): 3217–22. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3217.

Full text
Abstract:
The new unit putting into production is the supercritical boiler with a level of or above 600 MW, and most of them take the corner tangential combustion technology. The Long-term operation practice shows that there is gas temperature deviation on all the horizontal flues of boilers, which usually leads to the overheating tube burst of the high-temperature superheater and reheater, thus threats the safe and economic operation of power station. Towards the gas temperature deviation phenomenon that exists commonly in tangentially fired boiler, this paper went on the pertinent cold-state aerodynamic field test on the tangentially fired boilers in one new power plant and studied the airflow velocity at the furnace outlet in eight vertical levels by changing the SOFA horizontally rotating angle. The experiment showed that changing the baffles opening and horizontally rotating angle of SOFA air door could adjust airflow quite well and make it uniform, furthermore, the airflow can reach a basic balance at the biggest anti-tangential angle. This paper has some reference value towards improving the gas temperature deviation problem of tangentially fired boilers.
APA, Harvard, Vancouver, ISO, and other styles
13

He, Zhenbin, Xiaoming Fang, Zhengguo Zhang, and Xuenong Gao. "Numerical investigation on performance comparison of non-Newtonian fluid flow in vertical heat exchangers combined helical baffle with elliptic and circular tubes." Applied Thermal Engineering 100 (May 2016): 84–97. http://dx.doi.org/10.1016/j.applthermaleng.2016.02.033.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Yang, Guocheng, Guoliang Ding, Jie Chen, Wengang Yang, and Suyang Hu. "Experimental study on shell side heat transfer characteristics of two-phase propane flow condensation for vertical helically baffled shell-and-tube exchanger." International Journal of Refrigeration 107 (November 2019): 135–44. http://dx.doi.org/10.1016/j.ijrefrig.2019.08.017.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Rosa, Vitor da Silva, Maria Elena Santos Taqueda, José Luis de Paiva, Marlene Silva de Moraes, and Deovaldo de Moraes. "Nusselt’s correlations in agitated tanks using the spiral coil with Rushton turbine and PBT 45° impeller. Comparison with tanks containing vertical tube baffles." Applied Thermal Engineering 110 (January 2017): 1331–42. http://dx.doi.org/10.1016/j.applthermaleng.2016.09.035.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Kaid, Noureddine, and Houari Ameur. "Enhancement of the performance of a static mixer by combining the converging/diverging tube shapes and the baffling techniques." International Journal of Chemical Reactor Engineering 18, no. 4 (April 13, 2020). http://dx.doi.org/10.1515/ijcre-2019-0190.

Full text
Abstract:
AbstractThe performance of a newly designed static mixer is explored in this paper by numerical simulations. It concerns a converging/diverging circular tube equipped with opposing and staggered baffles. This new design of static mixer presents a cost-effective, easy-to-design, easy-to-maintain choice, with a minimum pressure drop and a good mixing index at low Reynolds numbers (from 60 to 700), to the currently used static mixers. The investigation was carried out numerically for different baffle clearances (cl/D = 0.3, 0.5, 0.7 and 1.0, respectively) and inclination angles (α = 0°, 30° and 45°, respectively), different ratios of inlet diameter-to-outlet diameter (Dd = d/D = 0.6, 0.8, 1.0, 1.2 and 1.4, respectively) and different Reynolds number values. The obtained results revealed that the diverging tube favors the mixing index while reducing the pressure drop. For a dimensionless baffle clearance (cl/D) of 0.5 and Re = 700, the mixing index has been increased from 0.78 for a simple tube (d/D = 1) having vertical baffles (α = 0°) until 0.95 for a diverging tube at the ratio (d/D) of 1.4 with the same vertical baffles (α = 0°). The increase in the ratio d/D has also yielded a decrease in pressure losses. Compared to the simple static mixer without baffles and having the same inlet as outlet sections, the maximum enhancement in mixing index was about 315.84% when d/D = 1.4 and Cl/D = 0.3 and α = 0°. However, a reduction in pressure drop by about 92% may be obtained when α = 30° with only a reduction in mixing index by 14% (compared to α = 0°).
APA, Harvard, Vancouver, ISO, and other styles
17

Venturi, Diego N., Waldir P. Martignoni, Dirceu Noriler, and Henry F. Meier. "Numerical Investigation of Air/Water and Hydrogen/Diesel Flow Across Tube Bundles With Baffles." Journal of Fluids Engineering 139, no. 9 (June 20, 2017). http://dx.doi.org/10.1115/1.4036444.

Full text
Abstract:
Two-phase flows across tube bundles are very commonly found in industrial heat exchange equipment such as shell and tube heat exchangers. However, recent studies published in the literature are generally performed on devices where the flow crosses the tube bundle in only a vertical or horizontal direction, lacking geometrical fidelity with industrial models, and the majority of them use air and water as the working fluids. Also, currently, experimental approaches and simulations are based on very simplified models. This paper reports the simulation of a laboratory full-scale tube bundle with a combination of vertical and horizontal flows and with two different baffle configurations. Also, it presents a similarity analysis to evaluate the influence of changing the fluids to hydrogen and diesel in the operational conditions of the hydrotreating. The volume of fluid (VOF) approach is used as the interface phenomena are very important. The air/water simulations show good agreement with classical correlations and are able to show the stratified behavior of the flow in the horizontal regions and the intermittent flow in the vertical regions. Also, the two baffle configurations are compared in terms of volume fraction and streamlines. When dealing with hydrogen/diesel flow using correlations and maps made for air/water, superficial velocity is recommended as similarity variable when a better prediction of the pressure drop is needed, and the modified superficial velocity is recommended for prediction of the volume-average void fraction and the outlet superficial void fraction.
APA, Harvard, Vancouver, ISO, and other styles
18

Luo, Lang, Yue-Jin Yu, Li-Peng Zheng, and Wen Xia. "The Study of Adding Heat Insulation Baffle on the Heat Transfer Performance of the Vertical U-shaped Ground Tube Heat Exchanger." DEStech Transactions on Engineering and Technology Research, mcee (March 27, 2017). http://dx.doi.org/10.12783/dtetr/mcee2016/6464.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Sauer, Bryan B., and Gregory T. Dee. "Surface Tensions of Molten Polymers as a Function of Molecular Weight and Temperature." MRS Proceedings 248 (1991). http://dx.doi.org/10.1557/proc-248-441.

Full text
Abstract:
AbstractSurface tensions of viscous molten polymers were measured with the modified Wilhelmy method. Small diameter fibers were used as vertical surface tension probes giving rise to rapid equilibration of the wetting meniscus. Noise due to thermal convection currents was suppressed by the use of a baffle tube to protect the electro-balance which allowed us to extend our studies to temperatures exceeding 400°C. The precision of the surface tension measurement at T<350°C for n≤10,000 Poise is better than 0.5%. Discussion is made of the rate of meniscus equilibration as a function fiber diameter. The surface tensions of polystyrene(PS), polydimethylsiloxane(PDMS), poly(ethylene glycol)(PEG), poly(propylene glycol)(PPG), and polyethylene(PE) were determined as a function of MW and temperature in order to compare with theoretical predictions. The Cahn-Hilliard interfacial gradient theory is used in conjunction with equation of state models using pressure-volume-temperature data as the input. Good agreement with experiment is found using one adjustable parameter which is independent of MW, for both polar and non-polar polymers.
APA, Harvard, Vancouver, ISO, and other styles
20

Dostál, M., K. Petera, and F. Rieger. "Measurement of Heat Transfer Coefficients in an Agitated Vessel with Tube Baffles." Acta Polytechnica 50, no. 2 (January 2, 2010). http://dx.doi.org/10.14311/1171.

Full text
Abstract:
Cooling or heating an agitated liquid is a very common operation in many industrial processes. A classic approach is to transfer the necessary heat through the vessel jacket. Another option, frequently used in the chemical and biochemical industries is to use the heat transfer area of vertical tube baffles. In large equipment, e.g. fermentor, the jacket surface is often not sufficient for large heat transfer requirements and tube baffles can help in such cases. It is then important to know the values of the heat transfer coefficients between the baffles and the agitated liquid. This paper presents the results of heat transfer measurements using the transient method when the agitated liquid is periodically heated and cooled by hot and cold water running through tube baffles. Solving the unsteady enthalpy balance, it is possible to determine the heat transfer coefficient. Our results are summarized by the Nusselt number correlations, which describe the dependency on the Reynolds number, and they are compared with other measurements obtained by a steady-state method.
APA, Harvard, Vancouver, ISO, and other styles
21

Ma, Ting, Min Zeng, Yanpeng Ji, and Qiuwang Wang. "CFD Optimization of Gas-Side Flow Channel Configuration Inside a High Temperature Bayonet Tube Heat Exchanger With Inner and Outer fins." Journal of Engineering for Gas Turbines and Power 133, no. 12 (September 1, 2011). http://dx.doi.org/10.1115/1.4004014.

Full text
Abstract:
In this paper, the gas-side fluid flow distribution inside a bayonet tube heat exchanger with inner and outer fins is numerically studied. The heat exchanger is designed based on the traditional bayonet tube heat exchanger, where compact continuous plain fins and wavelike fins are mounted on the outside and inside surfaces of outer tubes, respectively, to enhance the heat transfer performance. However, gross flow maldistribution and large vortices are observed in the gas-side flow channel of baseline design. In order to improve the flow uniformity, three modified designs are proposed. Three vertical plates and two inclined plates are mounted on the inlet manifold for Model B. For the Model C, another six bending plates are mounted on the middle manifolds and three pairs of them are connected together. The Model D has a similar structure as Model C except for the two additional baffles. The results indicate that the flow distributions of Models C and D are much more uniform under different inlet Reynolds number, especially in the high inlet Reynolds number. Although the flow distribution of Model D is the best, its pressure drop is 2.6 times higher than that of Model C. Therefore, the design of Model C is the most optimized structure. Compared with the original design, the nonuniformity of Model C can be reduced by 42% while the pressure drop is almost the same under the baseline condition.
APA, Harvard, Vancouver, ISO, and other styles
22

Abbas, Ahmad, Tauseef Ismail, Zahid Ayub, Adnan Ayub, Taqi Ahmad Cheema, Wei Li, and Jun Ye. "Shell Side Single-Phase Experimental Heat Transfer Analysis of a Vertically Oriented Single Segmental Baffle Bundle With Dimpled Tubes." Journal of Thermal Science and Engineering Applications 12, no. 1 (September 7, 2019). http://dx.doi.org/10.1115/1.4044349.

Full text
Abstract:
Abstract This paper presents single-phase shell side heat transfer performance of a vertically oriented shell and tube bundle. Steady-state single-phase experiments were conducted to determine the shell side Nusselt number with water and water/glycol solution as working fluids for both counter and parallel flow configurations. Experiments were carried out for Reynolds number varying from 3000 to 15,000 with Prandtl number ranging from 10 to 20. Counter flow configuration showed slightly better performance. Nusselt number correlations are presented for both configurations using a modified Wilson plot method. Comparison of results with previous studies and commercial software are presented. Thermal performance for all flow rate conditions showed close comparison to the results from a reputable commercial software. The correlation was further validated by comparing results for 30 different cases to calculations from 2 widely used commercial softwares. Comparison showed that the correlation can be used for the design of single-phase single segmental shell and tube heat exchangers.
APA, Harvard, Vancouver, ISO, and other styles
23

Brož, J., I. Fořt, R. Sperling, S. Jambere, M. Heiser, and F. Rieger. "Pumping Capacity of Pitched Blade Impellers in a Tall Vessel with a Draught Tube." Acta Polytechnica 44, no. 4 (January 4, 2004). http://dx.doi.org/10.14311/602.

Full text
Abstract:
A study was made of the pumping capacity of pitched blade impellers (two, three, four, five and six blade pitched blade impellers with pitch angles α = 35° and 45°) coaxially located in a cylindrical pilot plant vessel with cylindrical draught tube provided with a standard dished bottom. The draught tube was equipped with four equally spaced radial baffles above the impeller pumping liquid upwards towards the liquid surface. In all investigated cases the liquid aspect ratio H/T = 1.2 - 1.5, the draught tube / vessel diameter ratios DT /T = 0.2 and 0.4 and the impeller / draught tube diameter ratio D/DT = 0.875. The pumping capacity of the impeller was calculated from the radial profile of the axial component of the mean velocity in the draught tube below the impeller at such an axial distance from the impeller that the rotor does not affect the vorticity of the flow. The mean velocity was measured using a laser Doppler anemometer with forward scatter mode in a transparent draught tube and a transparent vessel of diameter T = 400 mm. Two series of experiments were performed, both of them under a turbulent regime of flow of the agitated liquid. First, the optimum height of the dished bottom was sought, and then the dependences of the dimensionless flow rate criterion and the impeller power number on the number of impeller blades were determined for both pitch angles tested under conditions of optimum ratio HT /DT. It follows from the results of the experiments that the optimum ratio HT /DT = 0.25 when the cross sectional areas of the horizontal flow around the bottom and the vertical inflow to the draught tube are the same. For all the tested pitched blade impellers the impeller power number when α = 45° exceeds the value of this quantity when pitch angle α = 35°, while the flow rate number when α = 35° exceeds this quantity when α = 45°. On the other hand, the absolute values of the impeller power number when the draught tube was introduced correspond fairly well to the dimensionless impeller power input measured in a system without a draught tube. However, the absolute values of the flow rate number found in the former system are significantly lower than the dimensionless impeller pumping capacity determined in the latter system. The hydraulic efficiency of pitched blade impellers N3Qp/Po for the investigated geometry of the agitated systems does not depend on the number of impeller blades, but it is significantly lower than the quantity determined in an agitated system with a dished bottom but without the draught tube.
APA, Harvard, Vancouver, ISO, and other styles
24

Major-Godlewska, Marta, and Joanna Karcz. "Process characteristics for a gas—liquid system agitated in a vessel equipped with a turbine impeller and tubular baffles." Chemical Papers 65, no. 2 (January 1, 2011). http://dx.doi.org/10.2478/s11696-010-0080-0.

Full text
Abstract:
AbstractResults of the experimental research on gas hold-up, power consumption for liquid phase and gas—liquid systems, and on residence time of the gas bubbles are presented in the paper for an agitated vessel with a turbine impeller. Distilled water or aqueous solutions of NaCl were used as the liquid phase. Air was dispersed into liquid as the gas phase. The studies were carried out in an agitated vessel of the inner diameter D = 0.634 m. Tubular baffles of the diameter of 0.7D, consisting of 24 vertical tubes of the diameter of 0.016D, were located inside a flat-bottomed tank. Turbines with six blades and the pitch of 90°, 60°, or 45°, respectively, were used for agitation. Measurements were carried out in the range of good dispersion of gas bubbles in the liquid within the turbulent regime of the liquid flow. Effects of the gas bubbles capability to coalesce on the gas hold-up, residence time of the gas bubbles, and power consumption were analyzed. Results of the power consumption (P G-L/P o = f 1(Kg, Fr)) and gas hold-up (φ= f 2(Kg, We, Y)) were approximated mathematically, using Eqs. (5) and (6), respectively. In Eq. (6), parameter Y was introduced in order to describe the influence of the bubbles capability to coalesce on the gas hold-up. The results of the study show that power consumption does not depend on the capability of bubbles to coalesce, but the pitch of the turbine impeller affects the power characteristics in such a physical system significantly. However, the residence time of the gas phase in agitated liquid depends on the pitch of the impeller blade and on the capability of bubbles to coalesce.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography