均匀热源条件下类叶状微通道矩形热沉的构形设计

Constructal Design of Rectangular Heat Sink with Leaf-Like Microchannel Under Uniform Heat Source

针对均匀背景热流条件下的散热问题,构建了类叶状微通道矩形热沉模型,基于构形理论,在给定热沉体积与液冷通道总体积的约束条件下,以热沉最高温度和压降最小化为目标,以微通道单元数、主通道与分支通道的夹角、主通道与分支通道的管径比为设计变量进行了优化设计。结果表明:通过增加微通道单元数、减小主通道与分支通道的夹角、采用较小的主通道与分支通道之管径比,可以降低热沉的最高温度,但是会增大压降损失。

For the heat dissipation problem with uniform background heat flow,a leaf-like microchannel rectangular heat sink model was constructed.Based on the constructal theory,under the constraints of a given heat sink volume and the total volume of the liquid cooling channels,with the minimizations of maximum temperature and pressure loss of the heat sink as the objectives,the optimal designs are carried out with the element number of microchannels,the angle between the main channel to the branch channel,and the tube diameter ratio of the main channel to the branch channel as the design variables.The results show that,by increasing the element number of microchannels,reducing the angle between the main channel and the branch channel,and adopting a smaller tube diameter ratio of the main channel to the branch channel,the maximum temperature can be reduced,but the pressure loss increases.