强化相变驱动的环路热管蒸发器可视化实验台建立及实验

Design of loop heat pipes experimental rig for phase change driving force and visual experiment

以研究强化相变驱动的环路热管的传热机制为目的,设计了一种带有相变空间的新型结构可视化平板热管蒸发器,实验研究了相变空间高度对热管蒸发器启动时间的影响与加热功率对其启动传热特性的影响,并观察了启动过程中工质在相变空间内的相变特性。实验结果:在不同相变空间高度情况下,实验蒸发器系统的启动时间存在明显差异,当相变空间为1mm时,系统启动时间较短,工质不易出现干涸现象。并且在启动加热功率不同时,系统启动热阻也不同,更高的加热功率对应更低的整体热阻。通过可视化实验的观察与分析,为建立环路热管相变驱动机制的可行性研究奠定了基础,为建立描述这一驱动机制的数学模型提供了实验依据。

To study the driving force of loop heat pipe,a new visual evaporator of flat loop heat pipe was established with phase change space which was used to observe the change of working fluid in the experimental process. One of the main experiments was to study the effect of height of phase change space on starting-time,and the other was to study the effect of heating power on thermal resistance of system. Results showed that the staring-time is not constant in the different height of phase change space,and the same to the thermal resistance of system in different heating powers. When the height of phase change space is 1mm,the starting-time is short and the working fluid cannot be dried up easily. The present study provides a basis for the establishment of closed system and for the creation of new mathematical model of the driving mechanism.