自然对流板肋热沉的三维数值结构优化

为提高热沉自然对流换热性能,利用ICEPAK软件对基板水平放置和基板竖直放置的两种放置取向的板肋热沉进行了数值模拟和结构优化。首先,通过与前人的实验结果进行对比,验证了数值模型的合理性;然后对一系列不同结构参数的热沉进行数值模拟,通过对比其散热性能寻找最优的热沉结构。热沉几何参数变化范围为肋片厚度1~15mm,肋片间隙6.75~33.75mm,肋片高度55~1395mm。结果表明在每个肋片高度下都有一组最优的肋厚t和肋间隙s值;当肋片高度超过720mm值时,基板水平放置热沉的热阻趋于一个稳定值;基板竖直放置热沉的热阻随肋片高度的增加一直在减小。

3D Numerical Geometric Optimization of Plate Fin Heat Sinks in Natural Convection Heat Transfer

Horizontal-base and vertical-base heat sinks are simulated and optimized geometrically in order to improve performance of heat sink in natural convection heat transfer with software ICEPAK. At first, the numerical model is validated through comparison of results between the experiments which has already existed and the numerical simulation herein. Then, a series of heat sinks with different geometric parameters are simulated. The optimal geometric parameter will be found through comparing their performance. Fin thickness varied from 1 to 15 mm, fin spacing varied from 6.75 to 33.75 mm and fin height varied from 55 to 1395 mm. The result indicates that there are optimal fin thickness t and optimal fin space s at every fin height. The smallest thermal resistance of horizontal-base heat sinks for certain fin height tends to be a constant value as fin height is over 720 mm. The smallest thermal resistance of vertical-base heat sinks for certain fin height always decreases as fin height increases.