基于BOBYQA算法的微小通道热沉优化设计

为了解决高热流密度电子器件散热问题,基于BOBYQA(bound optimization by quadratic approximation)梯度自由优化算法,并调用CFD软件的数值模拟结果,对微小通道热沉进行了优化设计.目标函数为热沉的总体热阻,约束了泵功消耗.分别讨论了不限制热沉总体高度以及约束高度2种条件下的最优解,详细计算了各个几何设计参数的优化路径.结果表明,窄深的通道更加有利于换热.与此同时,还计算了不同泵功消耗下的最优解,结果表明,随着泵功的增加,最优的热阻减小,但减小幅度随着泵功的增加而减小.

Optimal Design on Micro/Mini-channel Heat Sink by BOBYQA Algorithm

In order to solve the problem of heat dissipation for electronic devices with high heat flux, an optimal design of micro/mini-channel heat sink was presented by BOBYQA ( bound optimization by quadratic approximation ) algorithm combined with CFD software. The objective function was overall thermal resistance, and the constraint condition was pumping power consumption. The optimal results were calculated under unlimited and constrained height of heat sink. The results indicate that narrow and deep channel is more beneficial to heat transfer. Meanwhile, the optimal results under different pumping power were calculated, and the results indicate that the optimal thermal resistance decreases with increased pumping power. While, with continuously increased pumping power, the decrement decreases.