热负荷分布对双蒸发器环路热管传热性能的影响

Influence of thermal load distribution on heat transfer characteristics of dual-evaporator loop heat pipe

针对各自带液体补偿器的双蒸发器环路热管,采用模块化建模方式,数值模拟了不同热负荷分布下蒸发器毛细芯内的温度分布,确定了最优负荷分布模式以及系统传热极限。结果表明:施加于双蒸发器上的热负荷将同时影响双芯的温度变化,最优的热负荷分布模式为等热量分布。在一定的热沉温度下,并联双蒸发器环路热管的传热性能要明显优于单蒸发器环路热管,并以此求得该模型的传热极限为130 W,远大于同尺寸单蒸发器环路热管的传热极限37 W。

The impacts of thermal load distribution on steady-state heat transfer performance of dual-evaporator loop heat pipe were investigated,including the temperature characteristics of capillary wick in dual-evaporator,optimum thermal load distribution mode,and system heat transfer limit,using the modularized simulation method.The results show that the thermal loads applied on two evaporators influence the temperature distribution in each wick. The optimum thermal load distribution is even heat load mode.Given the heat sink temperature,the heat transfer capacity of dual-evaporator loop heat pipe is demonstrably superior to that of the same size single-evaporator loop heat pipe.Based on this simulation,the heat transfer limit of dual-evaporator loop heat pipe is 130 W,which is much higher than 37 W of single-evaporator loop heat pipe.