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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018026458
pages 89-105

THERMOHYDRAULIC CHARACTERISTICS OF MICROCHANNEL HEAT SINKS COMBINED WITH RIBS AND CAVITIES: EFFECTS OF GEOMETRIC PARAMETERS AND HEAT FLUX

Cong Li
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People's Republic of China
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
Yuxiang Hong
Department of Chemistry and Chemical Engineering, Lishui University, Lishui 323000, 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

RÉSUMÉ

The effects of the geometric parameters and heat flux on the thermohydraulic characteristics of microchannel heat sinks combined with ribs and cavities are investigated numerically. The numerical study is performed under conditions of laminar flow with conjugate heat transfer between silicon and water. In order to find the optimum substrate thickness, ratios of substrate thickness to microchannel height (Hs/Hc = 0, 0.25, 0.50, 0.75, 1.00, 1.25, and 1.50) are investigated. It is found that the temperature of the substrate surface firstly decreases and then gradually increases, the minimum temperature of the substrate surface occurs with Hs/Hc = 0.25. Furthermore, the microchannel heat sinks are studied at rib width to the spacing ratios (Lr/Sr = 0.25, 0.50, 0.75, and 1.0), rib heights to parallel sidewalls width ratios (Hr/Wc = 0.10, 0.15, 0.20, and 0.25), spacing to the parallel sidewalls width ratios (Sr/Wc = 4, 8, 12, and 16) and heat fluxes (qw = 50, 100, 150, 200, 250, and 300 W cm–2). The results show that the Performance Evaluation Criterion (PEC) is continued to slowly decrease with increase of qw. For all cases of qw, the maximum value of PEC occurs in model 2 with Lr/Sr = 0.50, Hr/Wc = 0.20, and Sr/Wc = 4. For Re > 320, the wall temperature of model 1 is slightly smaller than that of model 2.


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