• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2018, Vol. 54 ›› Issue (14): 185-190,197.doi: 10.3901/JME.2018.14.185

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Internal Flow Behavior in a Self-Similarity Microchannel Heat Sink and Optimization in Structure

WANG Zhe, LIU Hongtao, MO Zhengyu, XIE Guo, TANG Jiguo, SUN Licheng   

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065
  • Received:2017-05-06 Revised:2017-11-01 Online:2018-07-20 Published:2018-07-20

Abstract: High integration of electronic equipments leads to a significant increase in their heat release rate. More efficient cooling technology has to be applied to solve the problem. Self-similarity micro-channel heat sink (SSHS) is a new type of micro-channel heat sink proposed in recent years. It owns better heat transfer uniformity and wider applicability compared with that of a conventional MHS. In order to further analyze the comprehensive performance of a SSHS, the flow process inside a typical unit of SSHS is simulated numerically, based on which structural parameters of the unit were optimized. The simulation results showed that serious flow maldistribution among the overflow channels (micro channels) for SSHS, and changing the structure parameters of overflow channel has little influence on the flow distribution process. The uniformity in flow distribution is an inherent characteristic of SSHS. By modifying the inlet manifold channel with equal cross section to a contracting one, the flow mal-distribution was mitigated significantly, due to that the contracting inlet manifold channel weakens the stagnation effect at its end. The optimization results indicated that with a slope of 5°, the difference in flow distribution among the overflow channels was reduced form several times to about 35%, at the cost of averaged increase in low resistance no more than 10%.

Key words: flow distribution, microchannel heat sink, numerical simulation, self-similarity, structure optimization

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