微通道冷板换热及流阻特性计算与结构优化

Microchannel cold plate heat transfer and flow resistance characteristics calculation and structure optimization

设计了一种适用于阵列多芯片冷却的微通道液冷冷板。对冷板进行数值分析,研究矩形截面的高宽比对冷板的换热和流阻特性的影响。选择最优矩形截面高宽比的冷板,并对其进行流道结构优化,改善其流阻性能。结果表明,矩形截面当量直径固定时,摩擦阻力系数f和努塞尔数Nu随着矩形截面高宽比变大而增加;当高宽比在2~4之间时,冷板有较好的换热及流动性能;优化流道截面尺寸、弯角半径和出口流道形式后,冷板表现出良好的低压降传热特性,实现有效散热及满足压降要求。

A microchannel liquid cooled plate for array multichip cooling was designed.The influence of height width ratio of rectangular section on heat transfer and flow resistance of cold plate was studied.The cold plate with the optimal aspect ratio of rectangular section was selected,and its flow passage structure was optimized to improve its flow resistance performance.The results show that when the equivalent diameter of rectangular section is fixed,the friction coefficient and Nusselt number increase with the increase of the aspect ratio of rectangular section;when the aspect ratio is between 2 and 4,the cold plate has better heat transfer and flow performance;after optimizing the channel section size,bend radius and outlet channel form,the cold plate shows good heat transfer characteristics of low pressure drop,realizing effective heat dissipation and meeting the pressure drop requirements.