高热流密度多热源冷却用相变换热冷板实验研究

Experimental study on phase change heat transfer cooling plate for multiple heat sources cooling with high heat flux

针对高热流密度电子元器件的散热问题,设计加工了5块不同结构、不同加工方式的相变换热冷板,并研究了泵驱动相变换热冷板结构参数、热流密度、制冷剂流量、热源布置等因素对冷板换热性能、阻力、泵功耗等方面的影响。结果表明:所设计的钻孔冷板换热性能优异,对总发热量5000 W、热流密度38 W/cm^(2)的分散热源进行散热时,热源表面与冷板内制冷剂温差小于25℃,同时冷板阻力小于30 kPa,泵功耗小于35 W;冷板的加工方式对其换热效果影响显著,冷板应尽量采用一体化设计,减少热传递的环节,避免不同材料嵌合产生的接触热阻;当多个热源热流密度不同时,将热流密度较大的热源布置在靠近冷板入口处有更好的换热效果。

In view of the heat dissipation of electronic components with high heat flux,five phase change heat transfer cold plates with different structures and processing methods were designed,the effects of cold plate structural parameters,heat flux,refrigerant flow rate,and heat source layout on heat transfer performance,resistance of cold plate,and the pump power consumption were experimentally studied.The results show that the designed perforated cold plate has excellent heat transfer performance.The designed perforated cold plate maintains a temperature difference of less than 25℃between the heat source surface and the refrigerant inside the cold plate when dissipating a total heat output of 5000 W and a heat flux of 38 W/cm^(2),with cold plate resistance less than 30 kPa and pump power consumption less than 35 W.The processing method of cold plate has a significant influence on its heat transfer effect.The cold plate should adopt integrated design as far as possible to reduce the link of heat transfer and avoid the contact thermal resistance caused by the chimerism of different materials.When multiple heat sources have different heat flux densities,placing the higher heat flux heat source closer to the inlet of the cold plate achieves better heat transfer efficiency.