In the loop heat pipe (LHP)

the structure of the evaporation section is the most complex

and the capillary wick is a part that directly affects its working performance

so it has a great research value. To simulate the real operation of the capillary wick in LHP

an experimental device was designed to measure the surface temperature during the operation at room temperature. The heat transfer capacity of the capillary wick in the evaporative section of LHP was studied independently. The experimental study consisted of measuring the effective thermal conductivity using ethanol and water as working fluid at different heating power. It was found that the effective thermal conductivity of the ethanol-containing capillary wick is higher than that of the water-containing capillary wick at low heating power

while the results were reversed at high heating power. The conclusion of this experiment has a certain reference value for the evaluation of the heat transfer performance of the capillary wick

and it can also provide some experimental data for the simulation of the LHP evaporator.