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Keywords: pressure drop
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Proceedings Papers

Proc. ASME. HT2022, ASME 2022 Heat Transfer Summer Conference, V001T13A003, July 11–13, 2022
Publisher: American Society of Mechanical Engineers
Paper No: HT2022-81624
... space for bubbles, thus suppressing the reversal flow of the bubbles. Compared with ISM, SSM could break out the long slug bubbles more effectively and prevent gigantic bubbles from forming. The two-phase pressure drop in SSM could be reduced by 23% on average compared with ISM. This work is trying...
Proceedings Papers

Proc. ASME. HT2022, ASME 2022 Heat Transfer Summer Conference, V001T13A001, July 11–13, 2022
Publisher: American Society of Mechanical Engineers
Paper No: HT2022-78822
... tool for identifying the optimal loop charge for a given heat load. gravity driven two-phase loop thermosyphon pressure drop refrigerant charge mass Proceedings of the ASME 2022 Heat Transfer Summer Conference HT2022 July 11-13, 2022, Philadelphia, Pennsylvania HT2022-78822 EXPERIMENTAL...
Proceedings Papers

Proc. ASME. HT2021, ASME 2021 Heat Transfer Summer Conference, V001T05A001, June 16–18, 2021
Publisher: American Society of Mechanical Engineers
Paper No: HT2021-61091
... characteristics of all cases and cooling fluids has been made under the same value of Reynolds number and constant heat flux. The results show that the one fillet profile has a slight effect on pressure drop calculations and the heat transfer rate especially at high Reynold number. However, using two fillet...
Proceedings Papers

Proc. ASME. HT2021, ASME 2021 Heat Transfer Summer Conference, V001T06A002, June 16–18, 2021
Publisher: American Society of Mechanical Engineers
Paper No: HT2021-62804
... in terms of thermal resistance and pressure drop. The study was done using Reynolds numbers varying from 250 to 2000. As Reynolds number increases, the heat sink’s thermal resistance decreased while the pressure drop increased accordingly for all scenarios. The sinusoidal microchannels showed better...
Proceedings Papers

Proc. ASME. HT2021, ASME 2021 Heat Transfer Summer Conference, V001T05A003, June 16–18, 2021
Publisher: American Society of Mechanical Engineers
Paper No: HT2021-63099
..., on the heat sinks performance is studied. The studies are performed for Reynolds numbers varying from 250 to 2000, and the results are quantified based on thermal resistance and pressure drop. The heat sinks embedded with pin fins have better performance in terms of thermal resistance but at the same time...
Proceedings Papers

Proc. ASME. HT2020, ASME 2020 Heat Transfer Summer Conference, V001T09A003, July 13–15, 2020
Publisher: American Society of Mechanical Engineers
Paper No: HT2020-9006
... Abstract This study was performed to investigate the heat transfer and pressure drop of R134A during condensation inside a stainless steel micro-scale enhanced surface tube (EHT tube) and smooth tube. The tests were conducted at a saturation temperature of 45°C, over the mass fluxes range...
Proceedings Papers

Proc. ASME. HT2020, ASME 2020 Heat Transfer Summer Conference, V001T12A007, July 13–15, 2020
Publisher: American Society of Mechanical Engineers
Paper No: HT2020-9008
.... Wilson diagram method was used to determine the enhancement ratio of the water side heat transfer coefficient of EHT3 tube. It was found that the pressure drop increased with the increase of mass flux, while the heat transfer coefficient showed different trends, and the smooth tube was always the lowest...
Proceedings Papers

Proc. ASME. HT2013, Volume 4: Heat and Mass Transfer Under Extreme Conditions; Environmental Heat Transfer; Computational Heat Transfer; Visualization of Heat Transfer; Heat Transfer Education and Future Directions in Heat Transfer; Nuclear Energy, V004T14A017, July 14–19, 2013
Publisher: American Society of Mechanical Engineers
Paper No: HT2013-17435
... Fluid flow and heat transfer Trapezoidal CFD Reynolds Pressure Drop A computational simulation of the thermo hydraulic performance of a trapezoidal Off Set Strip Fin (OSF) is performed. The simulations are carried for Reynolds number ranging from 300 to 9000 considering three...
Proceedings Papers

Proc. ASME. HT2012, Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer, 61-69, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: HT2012-58078
... excessive pressure drops associated with full width twisted tape elements. The numerical analyses were performed with various free space ratios ( S = 0.0, 1.0, and 2.0) at a constant twist ratio ( TR ) of 5. Uniform heat flux was applied to the external surface of the tube and Reynolds numbers varied from...
Proceedings Papers

Proc. ASME. HT2012, Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer, 41-50, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: HT2012-58051
... and outlet qualities of 0.8 and 0.1, respectively. The results suggest that Tube 4 has the best thermal performance for its largest condensation heat transfer coefficient and relatively low pressure drop penalty. Condensation heat transfer coefficient decreases at first and then increases or flattens out...
Proceedings Papers

Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 3, 707-714, July 8–12, 2007
Publisher: American Society of Mechanical Engineers
Paper No: HT2007-32916
... by the inlet conditions. gas-liquid two-phase flow microchannel inlet geometry flow pattern pressure drop heat transfer 1 Copyright © 2007 by ASME Proceedings of HT2007 2007 ASME-JSME Thermal Engineering Summer Heat Transfer Conference July 8-12, 2007, Vancouver, British Columbia, CANADA HT2007...
Proceedings Papers

Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1, 539-546, July 8–12, 2007
Publisher: American Society of Mechanical Engineers
Paper No: HT2007-32914
.... It is found that both the heat transfer coefficient and the pressure drop for the shell-side are in good arrangement with experimental results. Comparing with circular-tube heat exchangers, the simulation result shows that the pressure drop of flat-tube heat exchangers decreases 12%∼20%, and the coefficient...
Proceedings Papers

Proc. ASME. HT2008, Heat Transfer: Volume 3, 485-491, August 10–14, 2008
Publisher: American Society of Mechanical Engineers
Paper No: HT2008-56075
... is obtained for S/D = 0.75. heat transfer enhancement rib inserted tube pressure drop performance comparison Proceedings of HT08 2008 ASME Summer Heat Transfer Conference August 10-14, 2008, Jacksonville, FL. USA N numerical method. The variation of Nusselt number, friction factor and triangular...
Topics: Heat transfer
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 4, 687-694, July 17–22, 2005
Publisher: American Society of Mechanical Engineers
Paper No: HT2005-72225
... the velocity and pressure drop for partially-confined heat sinks has been successfully developed. The air velocities flowing into heat sink U s through side bypass U 1 and top bypass U 2 for various 0.47<H/H c <1 ratios are evaluated, where H/H c is the ratio of the heat sink height to channel height...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 3, 531-541, July 17–22, 2005
Publisher: American Society of Mechanical Engineers
Paper No: HT2005-72024
... 03 04 2009 The use of streamlined tubes to reduce pressure drop across polymer tube bundles is considered because of the relative ease of fabrication. The drag and convective heat transfer coefficients along the outer surface of lenticular and elliptical tubes with minor-to-major axis...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 2, 297-304, July 17–22, 2005
Publisher: American Society of Mechanical Engineers
Paper No: HT2005-72528
... and predicted values show the satisfactory behaviour of both versions of the models. Keywords: minichannel, condensation, heat transfer, pressure drop. INTRODUCTION In this paper, following Kandlikar and Grande [5], minichannels are single tubes or multi-port extruded aluminum channels with inner hydraulic...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 2, 343-348, July 17–22, 2005
Publisher: American Society of Mechanical Engineers
Paper No: HT2005-72227
... 03 04 2009 The main purpose of this paper was to experimentally study the heat transfer and pressure drop characteristics of refrigerant R134a boiling inside a new geometry microfin helically coiled tube. Experiments were performed in a range of mass quality from 0.05 up to 0.9, mass...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 2, 233-238, July 17–22, 2005
Publisher: American Society of Mechanical Engineers
Paper No: HT2005-72843
... 03 04 2009 In this work a uniquely designed air-water bubbly flow heat transfer experiment is accomplished to investigate the characteristics of pressure drop of airflow and heat transfer between water and tubes for its potential application in evaporative cooling. The attempts...
Proceedings Papers

Proc. ASME. HT2003, Heat Transfer: Volume 1, 679-685, July 21–23, 2003
Publisher: American Society of Mechanical Engineers
Paper No: HT2003-47214
... 18 12 2008 Uniquely shaped tubes extruded with an inner circular flow passage and an outer streamlined profile are proposed to withstand the inside fluid pressure and simultaneously to reduce the pressure drop across heat exchanger tube bundles comprising hundreds of small-diameter...