垂直放置的高温热管翅起动与运行过程的实验研究

对一垂直放置的高温热管翅起动与运行过程进行了实验研究，给出起动与运行过程中的温度分布曲线。结果表明当高温热管翅垂直放置时，蒸发段底部温度随时间上升很快，蒸发段上部与冷凝段的温度分布都滞后于蒸发段底部温度，蒸发段出口处与冷凝段中部的温度相一致，冷凝段末端温度在运行时出现温度脉动现象。若将高温热管翅水平放置一段时间后再垂直测试，则发现热管翅冷凝段末端的温度脉动现象消失，冷凝段出现良好的等温性。进一步分析还表明，热管翅高功率下起动与运行时的温度分布高于低功率下的温度分布，稳态运行时冷凝段末端温度脉动现象减弱。

Experimental Research of the Startup and Operating Process of a Vertically Placed High-temperature Heat-pipe Fin

After an experimental study of the startup and operating process of a vertically installed high-temperature heat-pipe fin the temperature distribution curves during the said process were determined for the pipe fin. It was found that with the high-temperature heat-pipe fin being placed vertically the temperature at the bottom of an evaporation section would rise very quickly with time. The temperature at the upper portion of the evaporation section and at a condensation section lagged behind the temperature at the bottom of the evaporation section. The temperature at the evaporation section outlet coincides with that at the middle portion of the condensation section. Concerning the temperature at the end of the condensation section there appeared a phenomenon of temperature pulsation during operation. If the high-temperature heat-pipe fin is placed horizontally for a certain period of time and then tested in its vertical position, the temperature pulsation phenomenon at the condensation section end of the heat-pipe fin will disappear and there emerges instead a good isothermal condition at the condensation section. A further analysis has revealed that the startup and operation of the heat-pipe fin at a higher power rating will yield a higher temperature than that at a lower power rating. During a steady operation a weakening of the temperature pulsation phenomenon at the end portion of the condensation section can be observed.