小型毛细泵环(CPL)运行特性的实验分析

小型化是毛细泵环适应微小型高功率密度电子设备散热需求的一个发展趋势.对一小型毛细泵环进行实验研究,重点考察了重力场中不同姿态对毛细泵环运行特性的影响以及毛细泵环在高热流密度工作时的控温特性.根据实验结果可得:该小型毛细泵环可实现不同姿态下的迅速起动,并在热载荷递增过程中表现出良好的控温性能,最大传热能力达50 W,最高热流密度达到12.5 W/cm2,能够满足高功率密度电子元器件冷却的需求;当热流密度较低时,该毛细泵环可实现精确控温;而当热流密度较高时,蒸发器壁面温度波动较大,无法实现精确控温.

Experimental analysis of operating characteristics of a miniature capillary pumped loop

Miniaturization is a developing trend of CPLs to meet the requirement of heat dissipation of miniature high power- density electronic instruments. In this paper, a miniature CPL is experimentally investigated, in which the effect of attitudes on the operating characteristics of CPL in gravity and the thermal control characteristics at high heat flux are the main focus. Based on the experimental results, conclusions below can be drawn: 1 the CPL can achieve successful startup at different attitudes, and have good thermal control performance during power step-increase tests. 2 the effect of attitude on the performance of the CPL can be ignored in gravity, and the CPL has good adaptation to different force field. 3 the CPL has a maximum heat transport capacity greater than 50W and a maximum heat flux larger than 12.5 W/ cm2, which can satisfy the requirement of heat dissipation of miniature high power-density electronic instruments. 4 when the heat flux is small, the evaporator wall temperature is very close to that of the compensation chamber and fluctuates slightly or not, and can realize precise thermal control; however, when the heat flux is high, the evaporator wall temperature is obviously higher than that of the compensation chamber and fluctuates intensively, and can not realize precise thermal control under this situation.