基于中子成像（NR）技术对铜-丙烯环路热管（LHP）在不同加热功率（0、5和10 W）下的运行进行了可视化研究。结果表明：在加热功率为5 W时蒸发器内液体工质在减少，冷凝器能够充分冷凝，液体管线充满液体工质；在加热功率10 W时热管内部冷凝的液体工质量在减少，蒸发器开始出现烧干现象；环路热管能够成功启动并稳定运行，且随加热功率增加启动时间减少；LHP在5 W时内部的气液分布使得传热性能最佳，在10 W时风扇的强制对流并不能达到充分冷凝的效果，导致热管热阻增大，性能变差；LHP运行过程中气体管线部分存在残留液体工质，这会减少LHP的工质实际循环量，降低其传热性能。

Based on neutron imaging (NR) technology,the operation of a copperpropylene loop heat pipe (LHP) under different heating powers（0,5 and 10 W） was visualized.The result showed that when the heating power was 5 W,the amount of liquid working fluid in the evaporator was reduced,the condenser was fully utilized,and the liquid line was filled with liquid working medium.When the heating power was 10 W,the amount of condensed liquid inside the LHP is decreased,and drying phenomenon occurred in the evaporator.The loop heat pipe could successfully start up and stabilize,and the startup time decreased with the increase of heating power.The internal vaporliquid distribution of the LHP at 5 W optimized the heat transfer performance.At 10 W with forced convection from the fan,effect of sufficient condensation could not be achieved,resulting in an increase in the thermal resistance of the heat pipe and poor performance.Residual liquid working fluid was found in the vapor line during the LHP operation,which reduced the actual circulation of the LHP and reduced its heat transfer performance.

TK172.4

国家自然科学基金（51776121）