Convective heat transfer of microchannel heat sinks with pinfins and jets for a heat flux up to 500 W/cm2

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2024-11-29 DOI:10.1016/j.icheatmasstransfer.2024.108381

Xue Zhang , Puhang Jin , Gongnan Xie

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引用次数: 0

Abstract

This study proposes a kind of jet impingement microchannel heat sink with pinfins and then investigates the effects of jets arragement, pinfins placement angle, and pinfins shape on the flow characteristics and heat transfer of various heat sinks. It is found that the arrangement of jets has a minor influence on the flow pressure drop but has a significant influence on the heat transfer. Considering the heat transfer coefficient and pressure drop, the 5 × 6 array jet heat sink performs the best. The shape and placement angle of pinfins greatly affect the flow characteristics and heat transfer. Elliptical fins have a more advantageous influence on the overall performance of the heat sink compared with rectangular fins. The angle of the elliptical fins corresponding to maximum thermal performance factor value decreases with Reynolds number, the trend not seen in rectangular fins. The maximum thermal performance factor of heat sink, with rectangular fins at the angle of 15° is increase by 6.73 %, and it is increased by 7.86 % for the case with elliptical fins at the angle of 30°. The numerical simulations of the present design are justified by the analysis from the perspectives of entropy generation and Field Synergy Principle.

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带鳍和射流的微通道散热器的对流传热，热通量高达500 W/cm2

提出了一种带有鳍片的射流冲击式微通道散热器，研究了射流布置、鳍片放置角度和鳍片形状对不同散热片流动特性和换热性能的影响。射流布置对流动压降的影响较小，但对换热的影响较大。综合考虑换热系数和压降，5 × 6阵列射流散热器性能最好。翅片的形状和放置角度对流动特性和传热有很大影响。与矩形翅片相比，椭圆翅片对散热器整体性能的影响更为有利。热性能系数最大值所对应的椭圆翅片角度随雷诺数的增加而减小，而矩形翅片则没有这种趋势。矩形翅片为15°时，散热器的最大热性能系数提高了6.73%；椭圆翅片为30°时，散热器的最大热性能系数提高了7.86%。从熵产生和场协同原理的角度分析了本设计的数值模拟结果。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.