环路热管蒸发器毛细芯传热流动特性的一维分析

The One-Dimensional Analysis of Heat and Mass Transfer Processes in Loop Heat Pipe Evaporator

文章通过对液体在环路热管蒸发器毛细芯中的两种蒸发状态———表面蒸发状态、汽膜蒸发状态的分析,对液体在环路热管蒸发器毛细芯中的传热流动特性进行了一维数值计算,理论计算表明:在毛细芯正常工作状态下,液体在毛细芯中的蒸发属于表面蒸发,只有在进口液体存在过冷度时,汽膜蒸发才有可能存在。另外,文章还对毛细芯的壁厚、毛细芯的导热系数、进口液体的过冷度等因素对毛细芯传热流动特性的影响进行了讨论。

This paper analyzes two kinds of evaporation in loop heat pipe (LHP) evaporator, namely evaporation at porous wick surface and evaporation in the porous wick. One-dimensional calculation of heat and mass transfer processes is conducted. The results show that evaporation normally takes place at porous wick surface, and evaporation in the porous wick may possibly happen only when inlet liquid is subcooled. Moreover, variables having effects on heat and mass transfer processes are discussed, which include thickness and thermal conductance of porous wick, and sulcool of the inlet liquid.