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Khumaro Elli - One of the best experts on this subject based on the ideXlab platform.
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Studi & Pengujian Karakteristik Aliran Pada Cussons Friction Loss In Pipe Apparatus & Single Stage Centrifugal Pump Modifikasi penambahan Orifice dan Ball Valve
2017Co-Authors: Sya Bana, Khumaro ElliAbstract:CUSSONS Friction Loss in pipe apparatus adalah salah satu perangkat pengujian head Loss perpipaan yang ada di Laboratorium Mekanika dan Mesin – mesin Fluida. Perangkat ini dilengkapi dengan pompa sentrifugal. Analisa head Loss meliputi head Loss mayor dan head Loss minor. Sistem perpipaan CUSSONS Friction Loss in pipe apparatus menggunakan material Polyvinyl Chloride (PVC) pada bingkai dengan dimensi 4,65 m × 0,924 m. Fitting perpipaan terdiri atas long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice dan valve. Beberapa pressure tap dihubungkan dengan manometer raksa dengan specific gravity (SG) 13,6. Head Loss pipa dianalisia menggunakan formulasi Swamee-Jain dan persamaan Darcy Weisbach. Pompa sentrifugal digerakkan oleh motor sentrifugal singe stage INTERDAB MQC 175. Pengujian menggunakan variasi debit. Modifikasi dilakukan pada pipa III (Line III) dengan penambahan ball valve dengan 3 merk berbeda dan pada pipa II (Line II) penambahan orifice. Dari eksperimen diperoleh grafik hubungan Friction factor (f) dan bilangan Reynolds (Re) hasil yang didapatkan menunjukkan bahwa nilai f akan terus menurun seiring peningkatan nilai bilangan Reynolds. Pada pengujian head Loss minor didapatkan grafik hubungan coefficient minor Losses (K) dan Re pada 3 ball valve berbeda merk, masing – masing fitting. Seiring dengan bertambahnya nilai bilangan Reynolds maka coefficient Losses akan menurun dan selanjutnya nilai mendekati konstan dan pada pengujian orifice didapatkan kurva hubungan Reynolds (Re) dan Coefficient of discharge (Cd). Pada performa pompa, didapatkan head maksimal pompa 19,95 m. Penelitian dilakukan dengan variasi bilangan Reynolds yang didapatkan dari debit maksimal 62 L/min. Kata Kunci : (Head Loss, bilangan Reynolds , Coefficient of discharge, coefficient Losses, Darcy Weisbach, Single Stage Centrifugal Pump) ================================================================== CUSSONS Friction Loss in pipe apparatus is one of the testing device on the piping head Loss system in the Laboratory of Mechanics and Engineering - Fluid Machinery. The device is equipped with a centrifugal pump. Analysis of head Loss includes major and minor head Loss. CUSSONS Friction Loss in pipe apparatus piping system uses material Polyvinyl Chloride (PVC) in a frame with the dimensions of 4.65 m × 0.924 m. Fitting in the piping system consists of long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice and valve. Some pressure tap are connected with the mercury manometer with specific gravity (SG) 13.6. Head Loss of the piping system were analyzed using Swamee’s formulation and Darcy-Weisbach Jain’s equation. This centrifugal pump is driven by a single stage motor, INTERDAB MQC 175. The test uses a variation of the discharge. Modification was carried out on the pipe III (Line III) with the addition of ball valve in three different brands, meanwhile on the second pipe (Line II), there was orifice to be added on to the system. Obtained from the experiment is the correlation of Friction factor (f) and Reynolds number (Re) which result the value of f will continue to decline with the increase in the value of the Reynolds number. Head Loss minor testing showed the relevance between coefficient minor Losses (K) and Re at 3 different brands, each fitting. And, along with the rise of Reynolds number, the coefficients are going to fall and much further approaching nearly constant value while the curves of Reynolds (Re) and coefficient of discharge (Cd) can be gained from orifice testing. Pump performance test showed that maximum head pump was 19.95 m. This research was done by varying Reynolds number that was generated from the maximum discharge 62 L/min. Keywords : (Head Loss, Reynolds Number , Coefficient of discharge, Losses coefficient, Darcy Weisbach, Single Stage Centrifugal Pump)
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studi pengujian karakteristik aliran pada cussons Friction Loss in pipe apparatus single stage centrifugal pump modifikasi penambahan orifice dan ball valve
2017Co-Authors: Sya Bana, Khumaro ElliAbstract:CUSSONS Friction Loss in pipe apparatus adalah salah satu perangkat pengujian head Loss perpipaan yang ada di Laboratorium Mekanika dan Mesin – mesin Fluida. Perangkat ini dilengkapi dengan pompa sentrifugal. Analisa head Loss meliputi head Loss mayor dan head Loss minor. Sistem perpipaan CUSSONS Friction Loss in pipe apparatus menggunakan material Polyvinyl Chloride (PVC) pada bingkai dengan dimensi 4,65 m × 0,924 m. Fitting perpipaan terdiri atas long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice dan valve. Beberapa pressure tap dihubungkan dengan manometer raksa dengan specific gravity (SG) 13,6. Head Loss pipa dianalisia menggunakan formulasi Swamee-Jain dan persamaan Darcy Weisbach. Pompa sentrifugal digerakkan oleh motor sentrifugal singe stage INTERDAB MQC 175. Pengujian menggunakan variasi debit. Modifikasi dilakukan pada pipa III (Line III) dengan penambahan ball valve dengan 3 merk berbeda dan pada pipa II (Line II) penambahan orifice. Dari eksperimen diperoleh grafik hubungan Friction factor (f) dan bilangan Reynolds (Re) hasil yang didapatkan menunjukkan bahwa nilai f akan terus menurun seiring peningkatan nilai bilangan Reynolds. Pada pengujian head Loss minor didapatkan grafik hubungan coefficient minor Losses (K) dan Re pada 3 ball valve berbeda merk, masing – masing fitting. Seiring dengan bertambahnya nilai bilangan Reynolds maka coefficient Losses akan menurun dan selanjutnya nilai mendekati konstan dan pada pengujian orifice didapatkan kurva hubungan Reynolds (Re) dan Coefficient of discharge (Cd). Pada performa pompa, didapatkan head maksimal pompa 19,95 m. Penelitian dilakukan dengan variasi bilangan Reynolds yang didapatkan dari debit maksimal 62 L/min. Kata Kunci : (Head Loss, bilangan Reynolds , Coefficient of discharge, coefficient Losses, Darcy Weisbach, Single Stage Centrifugal Pump) ================================================================== CUSSONS Friction Loss in pipe apparatus is one of the testing device on the piping head Loss system in the Laboratory of Mechanics and Engineering - Fluid Machinery. The device is equipped with a centrifugal pump. Analysis of head Loss includes major and minor head Loss. CUSSONS Friction Loss in pipe apparatus piping system uses material Polyvinyl Chloride (PVC) in a frame with the dimensions of 4.65 m × 0.924 m. Fitting in the piping system consists of long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice and valve. Some pressure tap are connected with the mercury manometer with specific gravity (SG) 13.6. Head Loss of the piping system were analyzed using Swamee’s formulation and Darcy-Weisbach Jain’s equation. This centrifugal pump is driven by a single stage motor, INTERDAB MQC 175. The test uses a variation of the discharge. Modification was carried out on the pipe III (Line III) with the addition of ball valve in three different brands, meanwhile on the second pipe (Line II), there was orifice to be added on to the system. Obtained from the experiment is the correlation of Friction factor (f) and Reynolds number (Re) which result the value of f will continue to decline with the increase in the value of the Reynolds number. Head Loss minor testing showed the relevance between coefficient minor Losses (K) and Re at 3 different brands, each fitting. And, along with the rise of Reynolds number, the coefficients are going to fall and much further approaching nearly constant value while the curves of Reynolds (Re) and coefficient of discharge (Cd) can be gained from orifice testing. Pump performance test showed that maximum head pump was 19.95 m. This research was done by varying Reynolds number that was generated from the maximum discharge 62 L/min. Keywords : (Head Loss, Reynolds Number , Coefficient of discharge, Losses coefficient, Darcy Weisbach, Single Stage Centrifugal Pump)
Sya Bana - One of the best experts on this subject based on the ideXlab platform.
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Studi & Pengujian Karakteristik Aliran Pada Cussons Friction Loss In Pipe Apparatus & Single Stage Centrifugal Pump Modifikasi penambahan Orifice dan Ball Valve
2017Co-Authors: Sya Bana, Khumaro ElliAbstract:CUSSONS Friction Loss in pipe apparatus adalah salah satu perangkat pengujian head Loss perpipaan yang ada di Laboratorium Mekanika dan Mesin – mesin Fluida. Perangkat ini dilengkapi dengan pompa sentrifugal. Analisa head Loss meliputi head Loss mayor dan head Loss minor. Sistem perpipaan CUSSONS Friction Loss in pipe apparatus menggunakan material Polyvinyl Chloride (PVC) pada bingkai dengan dimensi 4,65 m × 0,924 m. Fitting perpipaan terdiri atas long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice dan valve. Beberapa pressure tap dihubungkan dengan manometer raksa dengan specific gravity (SG) 13,6. Head Loss pipa dianalisia menggunakan formulasi Swamee-Jain dan persamaan Darcy Weisbach. Pompa sentrifugal digerakkan oleh motor sentrifugal singe stage INTERDAB MQC 175. Pengujian menggunakan variasi debit. Modifikasi dilakukan pada pipa III (Line III) dengan penambahan ball valve dengan 3 merk berbeda dan pada pipa II (Line II) penambahan orifice. Dari eksperimen diperoleh grafik hubungan Friction factor (f) dan bilangan Reynolds (Re) hasil yang didapatkan menunjukkan bahwa nilai f akan terus menurun seiring peningkatan nilai bilangan Reynolds. Pada pengujian head Loss minor didapatkan grafik hubungan coefficient minor Losses (K) dan Re pada 3 ball valve berbeda merk, masing – masing fitting. Seiring dengan bertambahnya nilai bilangan Reynolds maka coefficient Losses akan menurun dan selanjutnya nilai mendekati konstan dan pada pengujian orifice didapatkan kurva hubungan Reynolds (Re) dan Coefficient of discharge (Cd). Pada performa pompa, didapatkan head maksimal pompa 19,95 m. Penelitian dilakukan dengan variasi bilangan Reynolds yang didapatkan dari debit maksimal 62 L/min. Kata Kunci : (Head Loss, bilangan Reynolds , Coefficient of discharge, coefficient Losses, Darcy Weisbach, Single Stage Centrifugal Pump) ================================================================== CUSSONS Friction Loss in pipe apparatus is one of the testing device on the piping head Loss system in the Laboratory of Mechanics and Engineering - Fluid Machinery. The device is equipped with a centrifugal pump. Analysis of head Loss includes major and minor head Loss. CUSSONS Friction Loss in pipe apparatus piping system uses material Polyvinyl Chloride (PVC) in a frame with the dimensions of 4.65 m × 0.924 m. Fitting in the piping system consists of long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice and valve. Some pressure tap are connected with the mercury manometer with specific gravity (SG) 13.6. Head Loss of the piping system were analyzed using Swamee’s formulation and Darcy-Weisbach Jain’s equation. This centrifugal pump is driven by a single stage motor, INTERDAB MQC 175. The test uses a variation of the discharge. Modification was carried out on the pipe III (Line III) with the addition of ball valve in three different brands, meanwhile on the second pipe (Line II), there was orifice to be added on to the system. Obtained from the experiment is the correlation of Friction factor (f) and Reynolds number (Re) which result the value of f will continue to decline with the increase in the value of the Reynolds number. Head Loss minor testing showed the relevance between coefficient minor Losses (K) and Re at 3 different brands, each fitting. And, along with the rise of Reynolds number, the coefficients are going to fall and much further approaching nearly constant value while the curves of Reynolds (Re) and coefficient of discharge (Cd) can be gained from orifice testing. Pump performance test showed that maximum head pump was 19.95 m. This research was done by varying Reynolds number that was generated from the maximum discharge 62 L/min. Keywords : (Head Loss, Reynolds Number , Coefficient of discharge, Losses coefficient, Darcy Weisbach, Single Stage Centrifugal Pump)
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studi pengujian karakteristik aliran pada cussons Friction Loss in pipe apparatus single stage centrifugal pump modifikasi penambahan orifice dan ball valve
2017Co-Authors: Sya Bana, Khumaro ElliAbstract:CUSSONS Friction Loss in pipe apparatus adalah salah satu perangkat pengujian head Loss perpipaan yang ada di Laboratorium Mekanika dan Mesin – mesin Fluida. Perangkat ini dilengkapi dengan pompa sentrifugal. Analisa head Loss meliputi head Loss mayor dan head Loss minor. Sistem perpipaan CUSSONS Friction Loss in pipe apparatus menggunakan material Polyvinyl Chloride (PVC) pada bingkai dengan dimensi 4,65 m × 0,924 m. Fitting perpipaan terdiri atas long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice dan valve. Beberapa pressure tap dihubungkan dengan manometer raksa dengan specific gravity (SG) 13,6. Head Loss pipa dianalisia menggunakan formulasi Swamee-Jain dan persamaan Darcy Weisbach. Pompa sentrifugal digerakkan oleh motor sentrifugal singe stage INTERDAB MQC 175. Pengujian menggunakan variasi debit. Modifikasi dilakukan pada pipa III (Line III) dengan penambahan ball valve dengan 3 merk berbeda dan pada pipa II (Line II) penambahan orifice. Dari eksperimen diperoleh grafik hubungan Friction factor (f) dan bilangan Reynolds (Re) hasil yang didapatkan menunjukkan bahwa nilai f akan terus menurun seiring peningkatan nilai bilangan Reynolds. Pada pengujian head Loss minor didapatkan grafik hubungan coefficient minor Losses (K) dan Re pada 3 ball valve berbeda merk, masing – masing fitting. Seiring dengan bertambahnya nilai bilangan Reynolds maka coefficient Losses akan menurun dan selanjutnya nilai mendekati konstan dan pada pengujian orifice didapatkan kurva hubungan Reynolds (Re) dan Coefficient of discharge (Cd). Pada performa pompa, didapatkan head maksimal pompa 19,95 m. Penelitian dilakukan dengan variasi bilangan Reynolds yang didapatkan dari debit maksimal 62 L/min. Kata Kunci : (Head Loss, bilangan Reynolds , Coefficient of discharge, coefficient Losses, Darcy Weisbach, Single Stage Centrifugal Pump) ================================================================== CUSSONS Friction Loss in pipe apparatus is one of the testing device on the piping head Loss system in the Laboratory of Mechanics and Engineering - Fluid Machinery. The device is equipped with a centrifugal pump. Analysis of head Loss includes major and minor head Loss. CUSSONS Friction Loss in pipe apparatus piping system uses material Polyvinyl Chloride (PVC) in a frame with the dimensions of 4.65 m × 0.924 m. Fitting in the piping system consists of long radius elbow 90 , standard radius elbow 90 , elbow 45 , venturimeter, orifice and valve. Some pressure tap are connected with the mercury manometer with specific gravity (SG) 13.6. Head Loss of the piping system were analyzed using Swamee’s formulation and Darcy-Weisbach Jain’s equation. This centrifugal pump is driven by a single stage motor, INTERDAB MQC 175. The test uses a variation of the discharge. Modification was carried out on the pipe III (Line III) with the addition of ball valve in three different brands, meanwhile on the second pipe (Line II), there was orifice to be added on to the system. Obtained from the experiment is the correlation of Friction factor (f) and Reynolds number (Re) which result the value of f will continue to decline with the increase in the value of the Reynolds number. Head Loss minor testing showed the relevance between coefficient minor Losses (K) and Re at 3 different brands, each fitting. And, along with the rise of Reynolds number, the coefficients are going to fall and much further approaching nearly constant value while the curves of Reynolds (Re) and coefficient of discharge (Cd) can be gained from orifice testing. Pump performance test showed that maximum head pump was 19.95 m. This research was done by varying Reynolds number that was generated from the maximum discharge 62 L/min. Keywords : (Head Loss, Reynolds Number , Coefficient of discharge, Losses coefficient, Darcy Weisbach, Single Stage Centrifugal Pump)
Pongjet Promvonge - One of the best experts on this subject based on the ideXlab platform.
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thermo hydraulic performance in heat exchanger tube with v shaped winglet vortex generator
Applied Thermal Engineering, 2020Co-Authors: Pongjet Promvonge, Sompol SkullongAbstract:Abstract This article presents the influence of V-shaped winglet vortex generators (V-WVGs) inserted into a constant heat-fluxed tube on thermal characteristics. In the present experiment, two V-WVG types: V-shaped rectangular- and delta-winglets (V-RW and V-DW) were mounted periodically on both sides of a straight tape before insertion into the tube with four relative winglet pitches (PR = P/D = 0.5, 1.0, 1.5 and 2.0) and three winglet blockage ratios (BR = b/D = 0.1, 0.15 and 0.2) at a fixed attack angle (α = 45°). Effects of geometric parameters of both V-WVGs on thermal performance enhancement were studied using air as tested fluid in a turbulence condition, Reynolds number (Re) ranging between 4130 and 25,900. The measured result has been shown that the V-RW performs higher rate of heat transfer as well as Friction Loss than the V-DW and the rise in BR results in higher increase of the heat transfer rate and Friction Loss while the increment in PR yields the reversing tendency for both V-WVG types. A new thermal-performance enhancement factor (TEF) has been introduced and it reveals that the V-DW has TEF in a range of 1.82–2.0 or around 3% above the V-RW where its peak regarded as the optimal point is at BR = 0.15 and PR = 1.0. Empirical correlations for the Nusselt number and Friction factor to assess the real merits of a heat exchanger tube with V-WVGs are determined.
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investigation of heat transfer enhancement by perforated helical twisted tapes
International Communications in Heat and Mass Transfer, 2014Co-Authors: K Nanan, Pongjet Promvonge, Chinaruk Thianpong, Smith EiamsaardAbstract:Abstract Influence of perforated helical twisted-tapes (P-HTTs) on the heat transfer, Friction Loss and thermal performance characteristics under a uniform heat flux condition is reported. The P-HTTs were obtained by perforating typical helical twisted-tapes (HTTs) with a prospect to reduce the Friction Loss of fluid flow. The experiments were conducted using P-HTTs' three different diameter ratios (d/w) of 0.2, 0.4 and 0.6, and three different perforation pitch ratios (s/w) of 1, 1.5 and 2. The helical pitch ratio and twist ratio were fixed at P/D = 2 and y/w = 3. Tests were performed for Reynolds number between 6000 and 20,000. The experiments using the plain tube and the tubes with HTTs were also carried out for assessment. The experimental results reveal that the use of P-HTTs leads to the reduction of Friction Loss as compare to that of HTT. Heat transfer, Friction Loss and thermal performance factor increase as d/w decreases and s/w increases. For the present range, the maximum thermal performance factor of 1.28 is obtained by using the P-HTT with d/w = 0.2 and s/w = 2.0 at the Reynolds number of 6000. In addition, the empirical correlations for Nusselt number, Friction factor and thermal performance factor give accurate predictions within ± 4%, ± 6% and ± 3%, respectively.
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experimental and numerical study on heat transfer enhancement in a channel with z shaped baffles
International Communications in Heat and Mass Transfer, 2012Co-Authors: Parkpoom Sriromreun, Chinaruk Thianpong, Pongjet PromvongeAbstract:Abstract The influence of baffle turbulators on heat transfer augmentation in a rectangular channel has been investigated experimentally and numerically. In the experiment, the baffles are placed in a zigzag shape (Z-shaped baffle) aligned in series on the isothermal-fluxed top wall, similar to the absorber plate of a solar air heater channel. The aim at using the Z-baffles is to create co-rotating vortex flows having a significant influence on the flow turbulence intensity leading to higher heat transfer enhancement in the tested channel. Effects of the Z-baffle height and pitch spacing length are examined to find the optimum thermal performance for the Reynolds number from 4400 to 20,400. The Z-baffles inclined to 45° relative to the main flow direction are characterized at three baffle- to channel-height ratios (e/H = 0.1, 0.2 and 0.3) and baffle pitch ratios (P/H = 1.5, 2 and 3). The experimental results show a significant effect of the presence of the Z-baffle on the heat transfer rate and Friction Loss over the smooth channel with no baffle. The Nusselt number, Friction factor and thermal performance enhancement factor for the in-phase 45° Z-baffles are found to be considerably higher than those for the out-phase 45° Z-baffle at a similar operating condition. The in-phase 45° Z-baffle with larger e/H provides higher heat transfer and Friction Loss than the one with smaller e/H while the shorter pitch length yields the higher Nu, f and TEF than the larger one. The numerical work is also conducted to investigate the flow Friction and heat transfer behaviors in the channel mounted with the 45° Z-baffles, and the numerical results are found in good agreement with experimental data.
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thermal behavior in solar air heater channel fitted with combined rib and delta winglet
International Communications in Heat and Mass Transfer, 2011Co-Authors: Pongjet Promvonge, C Khanoknaiyakarn, Sutapat Kwankaomeng, Chinaruk ThianpongAbstract:Abstract Effects of combined ribs and delta-winglet type vortex generators (DWs) on forced convection heat transfer and Friction Loss behaviors for turbulent airflow through a solar air heater channel are experimentally investigated in the present work. Measurements are carried out in the rectangular channel of aspect ratio, AR = 10 and height, H = 30 mm. The flow rate is presented in the form of Reynolds numbers based on the inlet hydraulic diameter of the channel ranging from 5000 to 22,000. The cross-section shape of the rib placed on the absorber plate to create a reverse-flow is an isosceles triangle with a single rib height, e/H = 0.2 and rib pitch, Pl/H = 1.33. Ten pairs of the DW with its height, b/H = 0.4; transverse pitch, Pt/H = 1 and three attack angles (α) of 60°, 45° and 30° are introduced and mounted on the lower plate entrance of the tested channel to generate longitudinal vortex flows. The experimental results show that the Nusselt number and Friction factor values for combined rib and DW are found to be much higher than those for the rib/DW alone. The larger attack angle of the DW leads to higher heat transfer and Friction Loss than the lower one. In common with the rib, the DW pointing upstream (PU-DW) is found to give higher heat transfer rate and Friction Loss than the DW pointing downstream (PD-DW) at a similar operating condition. In comparison, the largest attack angle (α = 60°) of the PU-DW yields the highest increase in both the Nusselt number and Friction factor while the lowest attack angle of the PD-DW provides the best thermal performance.
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heat transfer augmentation in a wedge ribbed channel using winglet vortex generators
International Communications in Heat and Mass Transfer, 2010Co-Authors: Teerapat Chompookham, Sutapat Kwankaomeng, Chinaruk Thianpong, Pongjet PromvongeAbstract:article i nfo Available online 18 October 2009 Experimental investigations have beencarried outtostudy the effect ofcombinedwedgeribs andwinglettype vortex generators (WVGs) on heat transfer and Friction Loss behaviors for turbulent airflow through a constant heat flux channel. To create a reverse flow in the channel, two types of wedge (right-triangle) ribs are introduced: wedge ribs pointing downstream and pointing upstream. The arrangements of both rib types placedinsidetheoppositechannelwallsarein-lineandstaggeredarrays.Togeneratelongitudinalvortex flows through the tested section, two pairs of the WVGs with the attack angle of 60° are mounted on the test channel entrance. The test channel has an aspect ratio, AR=10 and height, H=30 mm with a rib height, e/H=0.2 and rib pitch,P/H=1.33. The flowrate interms ofReynoldsnumbersisbasedon theinlet hydraulic diameter of the channel ranging from 5000 to 22,000. The presence of the combined ribs and the WVGs shows the significant increase in heat transfer rate and Friction Loss over the smooth channel. The Nusselt number and Friction factor values obtained from combined the ribs and the WVGs are found to be much higher than those from the ribs/ WVGs alone. In conjunction with the WVGs, the in-line wedge pointing downstream provides the highest increase in both the heat transfer rate and the Friction factor while the staggered wedge pointing upstream
Chuan Wang - One of the best experts on this subject based on the ideXlab platform.
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optimal design of multistage centrifugal pump based on the combined energy Loss model and computational fluid dynamics
Applied Energy, 2017Co-Authors: Chuan Wang, Weidong Shi, Xikun Wang, Xiaoping Jiang, Yang Yang, Ling ZhouAbstract:Abstract This paper proposes a method to optimize the design of a typical multistage centrifugal pump based on energy Loss model and Computational Fluid Dynamics (ELM/CFD). Different grid numbers, turbulence models, convergence precisions, and surface roughness are calculated for a typical multistage centrifugal pump. External characteristic experiments are also conducted to benchmark the numerical simulation. Based on the results, the ELM/CFD method was established including various kinds of energy Loss in the pump, such as disk Friction Loss, volumetric leakage Loss, interstage leakage Loss as well as the hydraulic Loss, which occurred at inlet section, outlet section, impeller, diffuser and pump cavity, respectively. The interactive relationships among the different types of energy Losses were systematically assessed. Applying suitable setting methods for numerical calculation renders more credible results, and ensuring the integrity of the calculation model is the key contributor to the accuracy of the results. The interstage leakage Loss is converted by the disk Friction Loss; thus, they are positively correlated, that is, the disk Friction Loss can be reduced by decreasing the interstage leakage Loss. Concurrently, the volumetric leakage Loss is negatively correlated with the disk Friction Loss; thus, increasing the volumetric leakage Loss can effectively reduce the disk Friction Loss. The increment of the volumetric leakage Loss is greater than the decrement of the disk Friction Loss for general centrifugal pumps. This relationship between these types of Losses, however, does not apply to pumps with significantly low specific speed. Therefore, reducing the volumetric leakage and interstage leakage Losses is the most effective technique to increase the efficiency of general centrifugal pumps. The impeller should be designed according to the maximum flow design method, because the inevitable volumetric leakage Loss will improve the pump efficiency under rated flow condition. Several methods have been proposed to improve the pump efficiency.
Chinaruk Thianpong - One of the best experts on this subject based on the ideXlab platform.
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investigation of heat transfer enhancement by perforated helical twisted tapes
International Communications in Heat and Mass Transfer, 2014Co-Authors: K Nanan, Pongjet Promvonge, Chinaruk Thianpong, Smith EiamsaardAbstract:Abstract Influence of perforated helical twisted-tapes (P-HTTs) on the heat transfer, Friction Loss and thermal performance characteristics under a uniform heat flux condition is reported. The P-HTTs were obtained by perforating typical helical twisted-tapes (HTTs) with a prospect to reduce the Friction Loss of fluid flow. The experiments were conducted using P-HTTs' three different diameter ratios (d/w) of 0.2, 0.4 and 0.6, and three different perforation pitch ratios (s/w) of 1, 1.5 and 2. The helical pitch ratio and twist ratio were fixed at P/D = 2 and y/w = 3. Tests were performed for Reynolds number between 6000 and 20,000. The experiments using the plain tube and the tubes with HTTs were also carried out for assessment. The experimental results reveal that the use of P-HTTs leads to the reduction of Friction Loss as compare to that of HTT. Heat transfer, Friction Loss and thermal performance factor increase as d/w decreases and s/w increases. For the present range, the maximum thermal performance factor of 1.28 is obtained by using the P-HTT with d/w = 0.2 and s/w = 2.0 at the Reynolds number of 6000. In addition, the empirical correlations for Nusselt number, Friction factor and thermal performance factor give accurate predictions within ± 4%, ± 6% and ± 3%, respectively.
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experimental and numerical study on heat transfer enhancement in a channel with z shaped baffles
International Communications in Heat and Mass Transfer, 2012Co-Authors: Parkpoom Sriromreun, Chinaruk Thianpong, Pongjet PromvongeAbstract:Abstract The influence of baffle turbulators on heat transfer augmentation in a rectangular channel has been investigated experimentally and numerically. In the experiment, the baffles are placed in a zigzag shape (Z-shaped baffle) aligned in series on the isothermal-fluxed top wall, similar to the absorber plate of a solar air heater channel. The aim at using the Z-baffles is to create co-rotating vortex flows having a significant influence on the flow turbulence intensity leading to higher heat transfer enhancement in the tested channel. Effects of the Z-baffle height and pitch spacing length are examined to find the optimum thermal performance for the Reynolds number from 4400 to 20,400. The Z-baffles inclined to 45° relative to the main flow direction are characterized at three baffle- to channel-height ratios (e/H = 0.1, 0.2 and 0.3) and baffle pitch ratios (P/H = 1.5, 2 and 3). The experimental results show a significant effect of the presence of the Z-baffle on the heat transfer rate and Friction Loss over the smooth channel with no baffle. The Nusselt number, Friction factor and thermal performance enhancement factor for the in-phase 45° Z-baffles are found to be considerably higher than those for the out-phase 45° Z-baffle at a similar operating condition. The in-phase 45° Z-baffle with larger e/H provides higher heat transfer and Friction Loss than the one with smaller e/H while the shorter pitch length yields the higher Nu, f and TEF than the larger one. The numerical work is also conducted to investigate the flow Friction and heat transfer behaviors in the channel mounted with the 45° Z-baffles, and the numerical results are found in good agreement with experimental data.
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thermal behavior in solar air heater channel fitted with combined rib and delta winglet
International Communications in Heat and Mass Transfer, 2011Co-Authors: Pongjet Promvonge, C Khanoknaiyakarn, Sutapat Kwankaomeng, Chinaruk ThianpongAbstract:Abstract Effects of combined ribs and delta-winglet type vortex generators (DWs) on forced convection heat transfer and Friction Loss behaviors for turbulent airflow through a solar air heater channel are experimentally investigated in the present work. Measurements are carried out in the rectangular channel of aspect ratio, AR = 10 and height, H = 30 mm. The flow rate is presented in the form of Reynolds numbers based on the inlet hydraulic diameter of the channel ranging from 5000 to 22,000. The cross-section shape of the rib placed on the absorber plate to create a reverse-flow is an isosceles triangle with a single rib height, e/H = 0.2 and rib pitch, Pl/H = 1.33. Ten pairs of the DW with its height, b/H = 0.4; transverse pitch, Pt/H = 1 and three attack angles (α) of 60°, 45° and 30° are introduced and mounted on the lower plate entrance of the tested channel to generate longitudinal vortex flows. The experimental results show that the Nusselt number and Friction factor values for combined rib and DW are found to be much higher than those for the rib/DW alone. The larger attack angle of the DW leads to higher heat transfer and Friction Loss than the lower one. In common with the rib, the DW pointing upstream (PU-DW) is found to give higher heat transfer rate and Friction Loss than the DW pointing downstream (PD-DW) at a similar operating condition. In comparison, the largest attack angle (α = 60°) of the PU-DW yields the highest increase in both the Nusselt number and Friction factor while the lowest attack angle of the PD-DW provides the best thermal performance.
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heat transfer augmentation in a wedge ribbed channel using winglet vortex generators
International Communications in Heat and Mass Transfer, 2010Co-Authors: Teerapat Chompookham, Sutapat Kwankaomeng, Chinaruk Thianpong, Pongjet PromvongeAbstract:article i nfo Available online 18 October 2009 Experimental investigations have beencarried outtostudy the effect ofcombinedwedgeribs andwinglettype vortex generators (WVGs) on heat transfer and Friction Loss behaviors for turbulent airflow through a constant heat flux channel. To create a reverse flow in the channel, two types of wedge (right-triangle) ribs are introduced: wedge ribs pointing downstream and pointing upstream. The arrangements of both rib types placedinsidetheoppositechannelwallsarein-lineandstaggeredarrays.Togeneratelongitudinalvortex flows through the tested section, two pairs of the WVGs with the attack angle of 60° are mounted on the test channel entrance. The test channel has an aspect ratio, AR=10 and height, H=30 mm with a rib height, e/H=0.2 and rib pitch,P/H=1.33. The flowrate interms ofReynoldsnumbersisbasedon theinlet hydraulic diameter of the channel ranging from 5000 to 22,000. The presence of the combined ribs and the WVGs shows the significant increase in heat transfer rate and Friction Loss over the smooth channel. The Nusselt number and Friction factor values obtained from combined the ribs and the WVGs are found to be much higher than those from the ribs/ WVGs alone. In conjunction with the WVGs, the in-line wedge pointing downstream provides the highest increase in both the heat transfer rate and the Friction factor while the staggered wedge pointing upstream
