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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2017021739
pages 103-119

LAMINAR FLOW AND HEAT-TRANSFER CHARACTERISTICS OF MICROCHANNEL HEAT SINKS COMBINED WITH RIBS AND CAVITIES FOR ELECTRONIC COOLING

Hong-Ju Guo
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People's Republic of China
Wei-Biao Ye
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People's Republic of China
Si-Min Huang
Key Laboratory of Distributed Energy Systems of Guangdong Province, Department of Energy and Chemical Engineering, Dongguan University of Technology, Dongguan 523808, People's Republic of China
Shu-Ying Wu
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People's Republic of China
De-Qi Peng
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People's Republic of China

RÉSUMÉ

Two microchannel heat sinks (MCHS) combined with ribs and cavities, with in-line and staggered arrangements, are investigated numerically. Laminar fluid flow, heat transfer, and the effects of geometric parameters on the Nusselt number and friction factor are examined. The overall performance evaluation criterion (PEC) for MCHS is used, based on thermal and hydraulic characteristics. Obtained results show that the combination of ribs and cavities can significantly prevent temperature increases along the flow direction and contributes to heat-transfer enhancement due to the interruption and redevelopment of thermal boundary layers. Additionally, the average Nusselt numbers of the two heat sinks are nearly equivalent. However, the average friction factor of the staggered arrangement is lower than that of the in-line arrangement. Thus, the PEC of the staggered arrangement is higher than that of the in-line arrangement under the same conditions. In particular, the best PEC is obtained to be Re = 320 for the two heat sinks.


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