内插多孔介质微通道热沉的数值模拟

Numerical Simulation on Heat Transfer and Resistance Characteristics in Micro-channel Heatsink Filled with Porous Medium

以水为流动介质,在微通道内添加堆叠金属丝网多孔介质,采用局部非热平衡假设和双能量方程模型,分析了内插不同目数金属丝网的微通道在层流状况下的传热与阻力特性,并采用数值计算方法对微通道热沉进行了数值模拟。结果表明,在微通道内插入多孔介质能显著提高热沉的对流换热系数、降低加热面平均温度,但阻力增加较大,且当插入的金属丝网目数为100目时,微通道热沉的对流换热系数较大,与填充其他目数金属丝网相比阻力增加较小。

A numerical simulation is conducted to study the heat transfer and resistance characteristics in a microchannel heatsink by taking the water as flow medium. The micro-channel heatsink is filled with wire mesh treated as porous medium. Based on the local thermal non-equilibrium assumption and two-energy equation model, the heat transfer and resistance characteristics for laminar flow have been performed in a micro-channel heatsink filled with wire mesh of differ- ent meshes. The results show that when the micro-channel heatsink filled with porous medium, its heat transfer coefficient increases significantly and the average temperature of the heating surface decreases, but the resistance increases obviously; when the micro-channel heatsink filled with 100 wire meshes, the heat transfer coefficient is comparatively larger than that in the other situations, and the resistance increases comparatively less.