A capillary pumped loop (CPL), because of its high power thermal transport character, is a system for the thermal discharge of electronic chips with high power loads, especially on the spacecrafts. With a working fluid having relatively larger heat of evaporation, methanol for example, it may transfer significant heat flux. As the evaporator in such a system is the most important part, the optimal design of CPL requires a thorough understanding of physical phenomena in evaporator. In this paper a mathematic model is constructed, in which the most important character is the treatment for the unsaturated region of porous wick in evaporator. Numerical simulation of heat and mass transfer in the porous wick of evaporator is carried out with a new way of modeling.
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