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Keywords: pressure drop
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Proceedings Papers

Proc. ASME. HT2021, ASME 2021 Heat Transfer Summer Conference, V001T05A001, June 16–18, 2021
Paper No: HT2021-61091
... drop calculations Density (kg/m3) and the heat transfer rate especially at high Reynold number. Greek symbols Dynamic viscosity (Pa s) However, using two fillet profile has a significant influence on heat transfer characteristics and pressure drop at all rates of Reynold number. The two-fillet...
Proceedings Papers

Proc. ASME. HT2021, ASME 2021 Heat Transfer Summer Conference, V001T06A002, June 16–18, 2021
Paper No: HT2021-62804
... was v velocity in the y-direction (m/s) conducted. The effect of the sine wave frequency, the pin fins' w velocity in the z-direction (m/s) diameter, and the hydraulic diameter of the microchannel are studied. The results are quantified in terms of thermal resistance GREEK ALPHABETS and pressure drop...
Proceedings Papers

Proc. ASME. HT2021, ASME 2021 Heat Transfer Summer Conference, V001T05A003, June 16–18, 2021
Paper No: HT2021-63099
... Engineering Department *National Water and Energy Center United Arab Emirates University Al Ain, Abu Dhabi, UAE ABSTRACT Re Reynolds number This article discusses the mathematical modeling of a P pressure drop (Pa) T temperature (K) straight microchannel heat sink, embedded with pin-fins, for u velocity...
Proceedings Papers

Proc. ASME. HT2020, ASME 2020 Heat Transfer Summer Conference, V001T09A003, July 13–15, 2020
Paper No: HT2020-9006
...Abstract 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...
Proceedings Papers

Proc. ASME. HT2020, ASME 2020 Heat Transfer Summer Conference, V001T12A007, July 13–15, 2020
Paper No: HT2020-9008
...) of different sizes and densities. Among them, the EHT3 tube has internal threads. 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...
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
Paper No: HT2013-17435
... to explore the behavior and performance of this kind of fin, showing that the hydraulic performance is well represented by correlations widely used in literature, while thermal performance seems to be under predicted. Keywords: Fluid flow and heat transfer; Trapezoidal, CFD, Reynolds, Pressure Drop. 1...
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
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
Paper No: HT2012-58051
... Micro-fin tube Condensation Pressure drop Heat transfer Mass flux An experimental investigation was performed for convective condensation of R410A inside four micro-fin tubes with the same outside diameter (OD) 5 mm and helix angle 18°. Data are for mass fluxes ranging from about 180...
Proceedings Papers

Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 3, 707-714, July 8–12, 2007
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
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
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 3, 531-541, July 17–22, 2005
Paper No: HT2005-72024
... 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 ratios of 0.3, 0.5...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 2, 233-238, July 17–22, 2005
Paper No: HT2005-72843
... 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 to reduce the pressure drop...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 2, 297-304, July 17–22, 2005
Paper No: HT2005-72528
... Present authors have measured heat transfer coefficients (Cavallini et al. [1, 2]) and pressure drops (Cavallini et al. [3, 4]) during condensation of R134a, R410A and R236ea inside a flat multiport mini-channel tube with a 1.4 mm hydraulic diameter. The experimental heat transfer coefficients...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 2, 343-348, July 17–22, 2005
Paper No: HT2005-72227
... 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 velocity 70 ∼ 380 kg/m...
Proceedings Papers

Proc. ASME. HT2005, Heat Transfer: Volume 4, 687-694, July 17–22, 2005
Paper No: HT2005-72225
... and average deviations of the velocities predicted by the present model from the experimental data are less than 20.31% and 13.13%, respectively, for confined compact heat sinks. Besides, the results show a good agreement between the predicted results and the experimental data of the pressure drop...
Proceedings Papers

Proc. ASME. HT2003, Heat Transfer: Volume 1, 679-685, July 21–23, 2003
Paper No: HT2003-47214
... 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, thin-walled polymer...