重力热管两相传热行为可视化实验研究

本文构建了玻璃-金属封接结构的重力热管,搭建了其可视化实验平台,考察了热流密度、加热高度、冷却水温度、充液量对热管传热行为的影响,获得了热管流型与传热特性的关联。结果表明:冷却水温度越高、热流密度越高时,热阻越小。充液高度越高,热阻越小,充液140 mm时热阻最小。可视化实验揭示充液50 mm,90 mm和140 mm的重力热管在不同热流密度下相变行为,并解释不同流型时的温度变化趋势。

Visual Experimental Study on Two-phase Heat Transfer Behavior of Gravity Heat Pipe

In this paper,a gravity heat pipe with glass-metal sealing structure is constructed,and its visual experimental platform is built.The effects of heat flux,heating height,heat flux,cooling water temperature,liquid filling on heat transfer behavior of the heat pipe are investigated,and the correlation between flow pattern and heat transfer characteristics of the heat pipe is obtained.The results show that thermal resistance reduces with increasing temperature of cooling water and input heat flux.The higher the liquid filling height is,the smaller the thermal resistance is.The visualization experiment reveals the phase change behavior of gravity heat pipes with liquid filling of 50mm,90mm and 140mm at different heat fluxes,and explains the temperature change trend of different flow patterns.