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On the Operational Parameters Effects on Two-Phase Pressure Drop Characteristics of Reentrant Copper Microchannels

[+] Author Affiliations
Daxiang Deng, Qingsong Huang, Yanlin Xie, Wei Zhou, Yue Huang

Xiamen University, Xiamen, China

Xiang Huang

Zhejiang University of Technology, Hangzhou, China

Paper No. MNHMT2016-6514, pp. V001T04A004; 8 pages
  • ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer
  • Volume 1: Micro/Nanofluidics and Lab-on-a-Chip; Nanofluids; Micro/Nanoscale Interfacial Transport Phenomena; Micro/Nanoscale Boiling and Condensation Heat Transfer; Micro/Nanoscale Thermal Radiation; Micro/Nanoscale Energy Devices and Systems
  • Biopolis, Singapore, January 4–6, 2016
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4965-1
  • Copyright © 2016 by ASME


Two-phase boiling in advanced microchannel heat sinks offers an efficient and attractive solution for heat dissipation of high-heat-flux devices. In this study, a type of reentrant copper microchannels was developed for heat sink cooling systems. It consisted of 14 parallel Ω-shaped reentrant copper microchannels with a hydraulic diameter of 781μm. Two-phase pressure drop characteristics were comprehensively accessed via flow boiling tests. Both deionized water and ethanol tests were conducted at inlet subcooling of 10°C and 40°C, mass fluxes of 125–300kg/m2·s, and a wide range of heat fluxes and vapor qualities. The effects of heat flux, mass flux, inlet subcoolings and coolants on the two-phase pressure drop were systematically explored. The results show that the two-phase pressure drop of reentrant copper microchannels generally increased with increasing heat fluxes and vapor qualities. The role of mass flux and inlet temperatures was dependent on the test coolant. The water tests presented smaller pressure drop than the ethanol ones. These results provide critical experimental information for the development of microchannel heat sink cooling systems, and are of considerable practical relevance.

Copyright © 2016 by ASME



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