EFFECT OF NON-CONDENSABLE GAS ON OPERATING TEMPERATURE FOR A MINIATURE LOOP HEAT PIPE

摘要：

　　The generation of non-condensable gas (NCG) in the closed two-phase heat transfer devices is an unavoidable phenomenon, which can adversely affect the thermal performance of such devices.In this work, experimental investigation of the effect of NCG on the steady-state operating temperature of a ammonia-stainless steel miniature loop heat pipe (LHP) was conducted.In the experiment, nitrogen was injected into the LHP as the NCG, and the operating temperature of the LHP was tested at different NCG inventories, heat loads applied to the evaporator and power cycle conditions.Experimental results reveal that NCG elevates the steady-state operating temperature of the evaporator;meanwhile, the more NCG exists in the LHP, the higher the operating temperature.The effect on the operating temperature is very salient under a low heat load because the utilization of the condenser may be shortened by the working fluid redistribution from the reservoir to condenser.But in the high heat load region, the effect is insignificant and can be generally neglected.Besides, temperature hysteresis was observed at a small NCG inventory, but such phenomenon disappeared when the NCG inventory increased.

关键词： non-condensable gas (NCG) loop heat pipe (LHP) operating temperature operation mode working fluid redistribution

作者: He Jiang Miao Jianyin Zhang Hongxing Ding Ting

作者单位: Beijing Institute of Spacecraft System Engineering You Yi Road, Hai Dian District, Beijing, China

会议类型: 国际会议

会议名称: The 11th International Heat Pipe Symposium(第十一届国际热管研讨会)

会议地点: 北京

会议语种:英文

页码: 118-124

在线出版日期: 2013-06-09（万方平台首次上网日期，不代表论文的发表时间）