中国空间科学技术

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平板型MLHP温度波动研究

盖东兴;刘伟;刘志春;杨金国;   

  1. 华中科技大学能源与动力工程学院;
  • 发布日期:2009-10-25

Investigation of Temperature Oscillation in Miniature Loop Heat Pipe with Flat Evaporator

Gai Dongxing Liu Wei Liu Zhichun Yang Jinguo(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074)   

  • Online:2009-10-25
  • Supported by:
    国家自然科学基金(No.50876035);; 中国博士点学科新进教师博士点基金(No.20070487093)

被引次数

6

摘要： 环路热管(Loop Heat Pipe,LHP)是一种靠蒸发器的毛细芯产生毛细力驱动回路运行,利用工质相变来传递热量的高效传热装置。研制了一套平板式蒸发器、风冷式冷凝器的小型环路热管(MLHP),MLHP的毛细芯为500目不锈钢丝网,工质为丙酮,蒸发器、冷凝器以及所有管路均由紫铜制成。主要研究了平板型MLHP在不同热负荷条件下的温度波动特性,并重点研究了倾角以及充灌量等对MLHP系统温度波动的影响,且给出相应的合理解释。实验结果表明,平板式MLHP在2~3W/cm2热流密度区间范围内容易发生温度波动。

关键词: 小型环路热管, 平板型蒸发器, 温度波动, 电子器件, 散热

Abstract: Loop heat pipes are heat transfer devices based on the evaporation and condensation of a working fluid,and using capillary pumping forces to ensure the fluid circulation.A series of tests have been carried out with a miniature loop heat pipe(MLHP) with flat evaporator and a fin-and-tube type condenser.The loop was made of pure copper with stainless mesh wick and acetone was used as the working fluid.At low heat loads,temperature oscillations were observed throughout the loop.The characteristics of temperature oscillation of the flat MLHP at heat fluxes from 2W/cm2 to 3W/cm2were studied.The compensation chamber was considered as the most critical component of the MLHP and its hydrodynamic state dictated the extent and the characteristics of the temperature oscillations for the input heat load.The heat leaks from the evaporator to the compensation chamber,the heat loss to ambient and subcooled liquid temperature dictated the vapor condition inside the compensation chamber,and the rate of vapor growth or dissipation dictated the nature of the temperature oscillation.The effects of different liquid charging ratio and the tilt angle to the temperature oscillations were studied in detail.