自相似结构微通道热沉内部流动特性及结构优化

doi:10.3901/JME.2018.14.185

机械工程学报 ›› 2018, Vol. 54 ›› Issue (14): 185-190,197.doi: 10.3901/JME.2018.14.185

• 可再生能源与工程热物理 • 上一篇下一篇

自相似结构微通道热沉内部流动特性及结构优化

王喆, 刘洪涛, 莫政宇, 谢果, 唐继国, 孙立成

四川大学水力学与山区河流开发保护国家重点实验室成都 610065

收稿日期:2017-05-06 修回日期:2017-11-01 出版日期:2018-07-20 发布日期:2018-07-20
作者简介:王喆,男,1992年出生。主要从事高效换热技术方面研究工作。E-mail:wangzhe2545@163.com;刘洪涛,男,1978年出生,博士,讲师。主要从事多相流与传热方面的研究工作。E-mail:echoliu215@sina.com;孙立成,男,1973年出生,博士,教授,博士研究生导师。主要从事多相流与传热方面的研究工作。E-mail:sunlicheng@scu.edu.cn
基金资助:
国家自然科学基金资助项目（51376052,51606130，51506099）。

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

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

摘要/Abstract

摘要： 电子设备高度集成化导致其发热功率同步大幅增加，需要更高效的冷却技术解决其散热问题。自相似微通道热沉（Self-similarity micro-channel heat sink，SSHS）是近几年提出的一种新型微通道换热结构，与一般的微通道热沉相比，具有更好的换热均匀性和更宽的适用性。利用数值方法对SSHS的一个完整工作单元内的流动过程进行了模拟计算，以进一步分析SSHS的综合性能，并在此基础上，改进和优化其结构参数。计算结果表明，SSHS内各溢流通道（微通道）间存在较严重的流量分配不均问题，改变溢流通道结构参数对其流量分配过程影响很小，流量分配不均是SSHS自身结构所决定的固有特性，通过将等截面分流通道结构设计改为渐縮式斜坡设计，可以减弱入口分流通道末端的滞止效应，从而可以大大缓解溢流通道间的流量分配不均匀性问题。优化计算结果表明，0.07～0.80 kg/h的流量范围内，当斜坡角度为5o时，可将溢流通道间的流量差由原来的数倍降至不超过35%，而平均流动阻力增加不超过10%。

关键词: 结构优化, 流动分配, 数值模拟, 微通道热沉, 自相似

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

中图分类号:

TL334

王喆, 刘洪涛, 莫政宇, 谢果, 唐继国, 孙立成. 自相似结构微通道热沉内部流动特性及结构优化[J]. 机械工程学报, 2018, 54(14): 185-190,197.

WANG Zhe, LIU Hongtao, MO Zhengyu, XIE Guo, TANG Jiguo, SUN Licheng. Internal Flow Behavior in a Self-Similarity Microchannel Heat Sink and Optimization in Structure[J]. Journal of Mechanical Engineering, 2018, 54(14): 185-190,197.

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自相似结构微通道热沉内部流动特性及结构优化

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

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