穿孔翅片水冷散热器的流动传热数值模拟

Numerical simulation of flow heat transfer in water-cooled radiators with perforated fins

本文针对传统直翅片散热器散热性能进行优化,利用COMSOL软件模拟研究了不同优化策略下穿孔直翅片散热器的传热性能,通过改变翅片孔径、间距、厚度及高度来探究散热器流动散热性能的影响,并得出该散热器的极限热流密度。结果表明穿孔有利于提高散热性能,在最优散热孔径1 mm时,散热性能相较直翅片提高8%。翅片孔径1 mm,间距0.2 mm,厚度1 mm,高度3 mm时,散热性能最优。散热最优组合在最大流量1.5 L/min时,极限热流密度为226.5 W/cm^(2),较传统直翅片散热器的极限热流密度提高了71%。

In this paper,the thermal performance of traditional straight-fin heat sink was optimised,and COMSOL simulation was used to study the heat transfer performance of perforated straight-fin heat sink under different optimisation strategies.The effect of heat sink flow on the thermal performance was investigated by varying the aperture diameter,pitch,thickness and height of the fins,and the limiting heat flow density was derived.The results show that perforation is conducive to improving the thermal performance.At the optimum aperture diameter of 1 mm,the thermal performance is increased by 8%compared with straight fins.In the conditions of the fin aperture of 1 mm,spacing 0.2 mm,thickness of 1 mm and height of 3 mm,there is the best thermal performance.Its ultimate heat flow density is 226.5 W/cm^(2) at the maximum flow rate of 1.5 L/min,which is 71%higher than that of the traditional straight-fin finned radiator.