基于空气紊流的中空底孔微柱阵列设计及强化散热数值研究

doi:10.19799/j.cnki.2095-4239.2021.0656

储能科学与技术 ›› 2022, Vol. 11 ›› Issue (6): 1980-1987.doi: 10.19799/j.cnki.2095-4239.2021.0656

基于空气紊流的中空底孔微柱阵列设计及强化散热数值研究

吴小凌¹(), 周涛², 刘钰照², 杜艳平²(), 陈会平¹, 李顺¹

^1.广州万宝集团压缩机有限公司，广东广州 510740
^2.上海交通大学中英国际低碳学院，上海 201306

收稿日期:2021-12-07 修回日期:2022-01-09 出版日期:2022-06-05 发布日期:2022-06-13
通讯作者: 杜艳平 E-mail:wuxiaoling@gzwbgc.com;yanping.du@sjtu.edu.cn
作者简介:吴小凌（1979—），男，工程师，长期从事冰箱压缩机研发、制冷系统研究及压缩机生产制造等工作，E-mail：wuxiaoling@gzwbgc.com；
基金资助:
上海市浦江人才计划(19PJ1405100);微纳多孔体高效热管及其在多能效压缩机制冷系统中的应用(19H100000469)

Numerical study on cooling enhancement of micro devices by designing turbulence based hollow micro pin-fin arrays with lateral holes

WU Xiaoling¹(), ZHOU Tao², LIU Yuzhao², DU Yanping²(), CHEN Huiping¹, LI Shun¹

^1.Wanbao Group Compressor Co. , Ltd. , Guangzhou 510740, Guangdong, China
^2.China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China

Received:2021-12-07 Revised:2022-01-09 Online:2022-06-05 Published:2022-06-13
Contact: DU Yanping E-mail:wuxiaoling@gzwbgc.com;yanping.du@sjtu.edu.cn

摘要/Abstract

摘要：

为了深入了解微结构对散热器换热性能的影响，实现不同工况下的高效冷却，本文针对不同散热器结构设计，对其与空气对流换热性能进行了研究。采用计算流体力学数值模拟方法，通过改变散热器单元的数值模拟条件、如来流方向、来流速度、热流密度等，对不同微结构形状、排布的换热单元的换热效率及流动情况进行了研究。结果发现，中空微柱结构散热器效果优于微翅片结构或翅片-微柱混合结构。中空微柱的优势在于促进了微柱周围空气的局部紊流，从而提高了近壁面边界层内冷空气平均流速。在垂直来流情况下，该设计有利于充分利用空气动能，对微柱内外散热面进行冲刷，从而提高对流换热效率。分析发现，随着微结构高度的增加，换热的提升比例降低。随微结构密度变化，散热器的平均传热系数存在一个峰值。这表明在考虑材料利用率的情况下，微结构参数存在一个最优值。本文设计优化的空心微柱在高5 mm、间距6 mm的情况下，换热性能达到最优值，与传统微翅片相比可将平均温度降低10%～15%。

关键词: 散热器, 空心柱, 强制对流, 数值模拟, 换热性能

Abstract:

This paper investigates the heat transfer performance with air convection for different heat sink structures, in order to gain insight into the influence of microstructures on the heat transfer performance of heat sinks and to achieve efficient cooling under different operating conditions. By changing the simulation conditions, such as flow direction, flow velocity, and heat flux, the numerical simulation method of computational fluid dynamics is used to study the heat transfer efficiency and airflow of heat sinks with different microstructures. It has been discovered that heat sinks with hollow micro pin-fin arrays have a better cooling effect than heat sinks with micro plate-fin arrays or hybrid arrays. The benefit of hollow micro pin-fin arrays is that they promote local turbulence of air around them, which increases the average flow rate of cold air in the near-wall boundary layer. In the case of the vertical inflow, the design allows for the best use of air kinetic energy to flush the surface inside and outside the micro-pillar, improving convective heat transfer efficiency. According to the analysis, as the height of the microstructure increases, the percentage of heat transfer enhancement decreases. Meanwhile, as the microstructure density varies, there is a peak in the average heat transfer coefficient of the heat sink. This indicates the existence of an optimal value for the microstructure parameters when material utilization is taken into account. When compared to heat sinks with conventional micro plate-fin arrays, the newly optimized hollow micro pin-fin arrays at a height of 5 mm and pitch of 6 mm can reduce the average temperature of heat sink by 10%-15%, ensuring the efficient performance of microdevices in a variety of working conditions.

Key words: heat sink, hollow micro pin-fin, forced convection, numerical simulation, heat transfer performance

中图分类号:

TK 02

吴小凌, 周涛, 刘钰照, 杜艳平, 陈会平, 李顺. 基于空气紊流的中空底孔微柱阵列设计及强化散热数值研究[J]. 储能科学与技术, 2022, 11(6): 1980-1987.

WU Xiaoling, ZHOU Tao, LIU Yuzhao, DU Yanping, CHEN Huiping, LI Shun. Numerical study on cooling enhancement of micro devices by designing turbulence based hollow micro pin-fin arrays with lateral holes[J]. Energy Storage Science and Technology, 2022, 11(6): 1980-1987.

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特征	高 /mm	直径 /mm	厚度 /mm	微柱排布间距/mm	面积 /(mm×mm)
微柱1	3	3	0.5	10.5	30×30
微柱2	3	3	0.5	6	30×30
微柱3	3	3	0.5	3.75	30×30
微翅片	3	—	1	6	30×30
混合散热器	3	—	—	6	150×150
微翅片散热器	3	—	1	6	150×150
微柱散热器	3	3	0.5	6	150×150

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基于空气紊流的中空底孔微柱阵列设计及强化散热数值研究

Numerical study on cooling enhancement of micro devices by designing turbulence based hollow micro pin-fin arrays with lateral holes

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