The Recent Research of Loop Heat Pipe

The loop heat pipe was first studied for the difficult temperature control conditions under aerospace conditions. The loop heat pipe is composed of evaporator, reservoir, capillary wick, vapor/liquid line, and condenser. Different working fluids, different liquid filling amounts, different capillary wicks, different sizes, and different cooling methods will have an important impact on the performance of the loop heat pipe. Therefore, if the loop heat pipe wants to have good heat transfer efficiency, it is imperative to discuss good processing steps and processing techniques. When the loop heat pipe is running, the capillary wick is heated, the liquid in the capillary wick is heated and vaporized, and the gas passes through the vapor line to enter the condenser for condensation. After the condensation, the liquid flows back into the reservoir and the inside of the capillary wick through the liquid line. How to ensure the forward operation of the gas at the evaporator to reduce the reverse leakage heat during this cycle, how to ensure the condenser condensation efficiency is sufficient, etc. are all issues to be considered. This chapter describes in detail the processing and optimization methods for each part, and prepares a loop heat pipe that can work normally.