| 摘要: |
| 在环路热管运行中工质蒸发产生的气相压头有着重要作用。为了研究工质相变产生的气相压头的影响，本文设计了一种新型结构，将环路热管蒸发器内的吸液芯与加热底板彻底分离形成蒸发腔，使蒸发器内的传热传质相对分离，维持蒸发现象仅在蒸发腔内发生，以此来提高环路热管的驱动力。本文选用导热系数较低的不锈钢-镍作为吸液芯材料，尽可能的减少蒸发器的“漏热”现象。通过实验研究了不同真空度（95.3~101.1 kPa）时环路热管系统的启动性能。结果表明：此类型的环路热管可以在不同真空度下正常运行，并且真空度越高，环路热管的运行温度越低，启动时间越短，热阻越低。同时将突出气相压头的环路热管与另外三种不同结构的毛细抽力环路热管进行对比，发现突出气相压头的环路热管具有更低的运行热阻（0.14 ℃/W）。 |
| 关键词: 环路热管 气相压头 真空度 运行温度 热阻 |
| DOI： |
| 投稿时间：2019-05-06 修订日期：2019-08-06
|
| 基金项目:国家自然科学基金（51376137）项目资助。 |
|
| Effect of Vacuum on the Start-up Performance of Loop Heat Pipe Enhanced by Pressure Head of Evaporation |
|
Zhang Guodong, Sun Huan, Zhu Kai, Li Xueqiang, Yang Zhen, Wang Yabo
|
| (Key Laboratory of Refrigeration Technology, Tianjin University of Commerce) |
| Abstract: |
| The influence of the pressure head of evaporation on the operation of a loop heat pipe (LHP) is important to the performance of LHP. In this paper, the wick was separated from the heating surface;consequently, a steam chamber was formed. Simultaneously, the heat and mass transfer in the evaporator were separated. Consequently, the driving force (especially the pressure head of evaporation) was enhanced. Heat leakage was decreased as much as possible due to the low thermal conductivity of the wick. Experiments were conducted to investigate the effectof different partial vacuums(95.3–101.1 kPa) on the start-up performance for the new LHP. This newdesign was able to operate at different partial vacuums; the operating temperature, start-up time, and thermal resistance decreased with increasedpartial vacuum. Simultaneously, this LHP showed a lower thermal resistance (0.14oC/W) compared with that of LHP driven by capillary forces. |
| Key words: loop heat pipe evaporation pressure vacuum degree operating temperature thermal resistance |
