微通道形状对自相似热沉综合性能的影响分析

doi:10.16085/j.issn.1000-6613.2017-1465

化工进展 ›› 2017, Vol. 36 ›› Issue (S1): 58-63.DOI: 10.16085/j.issn.1000-6613.2017-1465

微通道形状对自相似热沉综合性能的影响分析

王喆, 孙立成, 刘洪涛, 唐继国, 鲍静静

四川大学水利水电学院, 水力学与山区河流开发保护国家重点实验室, 四川成都 610065

收稿日期:2017-07-17 修回日期:2017-07-25 出版日期:2017-12-31 发布日期:2017-12-13
通讯作者: 孙立成,教授,研究方向为两相流动与沸腾传热。
作者简介:王喆(1992-),男,硕士研究生。
基金资助:
国家自然科学基金项目（51376052，51606130，51506099）。

An investigation on the influence of the microchannel shape on performance of a self-similar micro-channel heat sink

WANG Zhe, SUN Licheng, LIU Hongtao, TANG Jiguo, BAO Jingjing

State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, Sichuan, China

Received:2017-07-17 Revised:2017-07-25 Online:2017-12-31 Published:2017-12-13

摘要/Abstract

摘要： 自相似微通道热沉（SSHS）作为一种新的换热结构设计，比一般的微通道热沉（MHS）具有更好的综合性能。前期工作通过将内部分流通道改为渐缩式斜坡结构，使内部流量分配不均受到了很大抑制。本文在此基础上，利用数值模拟方法进一步分析了微通道（溢流通道）形状对SSHS流动及传热过程的影响。计算结果表明，原设计中溢流通道内存在较大的低流速区，导致了不均匀的换热过程；将矩形截面微通道改为梯形截面，可以减小溢流通道内低速区的流通面积，从而使微通道内的流动和换热过程更加均匀；进一步对比分析发现，随着溢流通道顶部宽度m_w减小，低流速区域占比进一步减小，换热均匀性有所提高；该结构优化方案对流动阻力的影响较小，流量在0.18～1.8kg/h范围内，流动阻力增加平均不超过5%，但换热均匀性平均提高15%左右。

关键词: 自相似热沉, 微通道, 渐縮式分流通道, 数值模拟, 梯形, 传热

Abstract: As a new design of heat sink,Self-similarity microchannel heat sink(SSHS)has a better overall performance than a common Microchannel heat sink(MHS).The manifold channel of the SSHS was modified to a contracting tapered one in our previous work,making an improved internal flow distribution.A further numerical work in current work was carried out to analyze the influence of the microchannel(overflow channel)shape on the flow and heat transfer process inside a self-similar heat sink.The results showed that there exists a relatively large low velocity region in the overflow channel,resulting in the uniform heat transfer process wherein.With changing the rectangular microchannel to a trapezoid one,the low velocity region could be reduced,realizing a more uniform flow and heat transfer process inside the microchannel.With the m_w decreasing,the proportion of the low velocity region was reduced further and the uniformity in heat exchange was improved accordingly.In the meantime,this optimization scheme had little effect on flow resistance.The heat transfer uniformity was increased about 15% with a sacrifice of the increase in flow resistance no more than 5% with the flow rate covering 0.18-1.8kg/h.

Key words: self similarity heat sink, microchannel, tapered manifold channel, numerical simulation, trapezoid, heat transfer

中图分类号:

TK121

王喆, 孙立成, 刘洪涛, 唐继国, 鲍静静. 微通道形状对自相似热沉综合性能的影响分析[J]. 化工进展, 2017, 36(S1): 58-63.

WANG Zhe, SUN Licheng, LIU Hongtao, TANG Jiguo, BAO Jingjing. An investigation on the influence of the microchannel shape on performance of a self-similar micro-channel heat sink[J]. Chemical Industry and Engineering Progress, 2017, 36(S1): 58-63.

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微通道形状对自相似热沉综合性能的影响分析

An investigation on the influence of the microchannel shape on performance of a self-similar micro-channel heat sink

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