Study On Heat Transfer Of Loop Heat Pipe Evaporator

Loop heat pipe (LHP) has very good application prospects in the field of cooling electronic equipment. Therefore study on the LHP in depth has very important significance. The technology has been matured after decades of development, but the research on the LHP is focused on the gravity field of the ground and the micro-gravity environment of the space, while few researchers study on the heat transfer characteristics of the LHP in the field of acceleration.The main content of this paper is calculating the pressure drop and the variation of the temperature of the LHP system under steady state and studying the heat transfer characteristics of the LHP under the field of variable acceleration. First, the operating parameters of the LHP are analyzed at the condition of steady state . And then the numerical model of evaporator is established in different acceleration working conditions. Finally, the fluent software is used to simulation the variable acceleration conditions. The simulation is divided into three parts: first, the variation of the temperature and pressure are calculated under the steady state; Second, while the acceleration is zero, the temperature distribution of the evaporator is simulated and compared the results of the simulation with experimental. Third, the temperature distribution of evaporator is simulated under the variable acceleration conditions. Then the simulation results are analyzed.The simulation results show that the influence of the acceleration on the operating temperature depends on the heat load of the evaporator. When the heat load is 25w, regardless of the direction of the acceleration, the operation temperature of the LHP will increase with the increase of acceleration. When the heat load is 100w, if the direction of the acceleration and the flow of work fluid in the evaporator are opposite, the operating temperature will decrease with the increase of acceleration. If the direction of acceleration and the flow of work fluid in the evaporator is same, the operating temperature will increase with the acceleration increase at first, and then decrease with the acceleration increase.