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用于最小化熵产生的含多孔介质矩形微通道散热器的构形优化

Constructal Optimization of Rectangular Microchannel Heat Sink with Porous Medium for Entropy Generation Minimization.

作者信息

Li Wenlong, Xie Zhihui, Xi Kun, Xia Shaojun, Ge Yanlin

机构信息

College of Power Engineering, Naval University of Engineering, Wuhan 430033, China.

Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China.

出版信息

Entropy (Basel). 2021 Nov 17;23(11):1528. doi: 10.3390/e23111528.

DOI:10.3390/e23111528
PMID:34828226
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8624263/
Abstract

A model of rectangular microchannel heat sink (MCHS) with porous medium (PM) is developed. Aspect ratio of heat sink (HS) cell and length-width ratio of HS are optimized by numerical simulation method for entropy generation minimization (EGM) according to constructal theory. The effects of inlet Reynolds number () of coolant, heat flux on bottom, porosity and volume proportion of PM on dimensionless entropy generation rate (DEGR) are analyzed. From the results, there are optimal aspect ratios to minimize DEGR. Given the initial condition, DEGR is 33.10% lower than its initial value after the aspect ratio is optimized. With the increase of , the optimal aspect ratio declines, and the minimum DEGR drops as well. DEGR gets larger and the optimal aspect ratio remains constant with the increasing of heat flux on bottom. For the different volume proportion of PM, the optimal aspect ratios are diverse, but the minimum DEGR almost stays unchanged. The twice minimized DEGR, which results from aspect ratio and length-width ratio optimized simultaneously, is 10.70% lower than the once minimized DEGR. For a rectangular bottom, a lower DEGR can be reached by choosing the proper direction of fluid flow.

摘要

建立了一种带有多孔介质（PM）的矩形微通道散热器（MCHS）模型。根据构形理论，采用数值模拟方法对散热器（HS）单元的纵横比和HS的长宽比进行了优化，以实现熵产生最小化（EGM）。分析了冷却剂入口雷诺数（）、底部热流密度、孔隙率以及PM的体积分数对无量纲熵产生率（DEGR）的影响。结果表明，存在使DEGR最小化的最佳纵横比。在给定初始条件下，纵横比优化后，DEGR比其初始值降低了33.10%。随着的增加，最佳纵横比下降，最小DEGR也随之下降。随着底部热流密度的增加，DEGR增大，最佳纵横比保持不变。对于不同的PM体积分数，最佳纵横比各不相同，但最小DEGR几乎保持不变。通过同时优化纵横比和长宽比得到的二次最小化DEGR比一次最小化DEGR低10.70%。对于矩形底部，通过选择合适的流体流动方向可以达到较低的DEGR。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/11b8e9323178/entropy-23-01528-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/4783a0cf66fe/entropy-23-01528-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/62fe1132d53a/entropy-23-01528-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/11b8e9323178/entropy-23-01528-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/e8f97ee28a6b/entropy-23-01528-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/9dab314d16b5/entropy-23-01528-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/603f905ac448/entropy-23-01528-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/929a6c5d2bbc/entropy-23-01528-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/7ffc6a9ed999/entropy-23-01528-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/4783a0cf66fe/entropy-23-01528-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/62fe1132d53a/entropy-23-01528-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/af1be8c21b00/entropy-23-01528-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/6994575397b4/entropy-23-01528-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c0f/8624263/11b8e9323178/entropy-23-01528-g012.jpg

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