轴向微槽结构平板热管毛细力表征及性能研究

Capillary Force and Performance of Flat Plate Heat Pipe with Axial Microgroove Structure

通过设计并搭建实验平台,对几种不同槽道结构尺寸的轴向平板微槽热管进行了毛细力测试,分析了槽道形状尺寸、不同工质、表面改性等因素对微热管毛细力大小及其性能的影响。利用动态高度法对不同工况下的微热管槽道进行毛细力测试,通过试验分析来对微热管进行结构优化。结果表明,选用丙酮工质充液毛细现象最为明显;对于同一种类型微槽热管的槽道越深则毛细作用越明显;而对于Ω形槽道,因其结构不存在常见几何形状所具有的尖角区域,毛细作用仅优于浅矩形结构,但其结构可以大幅降低冷凝回流时所需的毛细驱动力,故传热性能很好;而低温等离子体改性后平板微热管的毛细力增大,进一步说明了微槽表面性能对毛细力大小的影响。

Through the design and construction of the experimental platform,the capillary force test of several axial groove micro-slot heat pipes of different channel structure dimensions was carried out,and the capillary size and size of the channel,different working fluids,surface modification and other factors were analyzed,as well as its performance impact.The dynamic height method was used to test the capillary force of the micro-heat pipe in different working conditions,and the structure of the micro-heat pipe was optimized through test analysis.The results show that the capillary filling phenomenon of acetone working medium is the most obvious;For the same type of micro-groove heat pipe,the deeper the channel,the more obvious the capillary effect;ForΩ-shaped groove way,because of its structure there is no common geometric angle of area,capillary action is better than only shallow rectangular structure,but its structure can greatly reduce the condenser when the capillary force is required,so the heat transfer performance is very good;The capillary force of the flat micro-heat pipe is increased after the low temperature plasma modification,which further indicates the influence of the surface properties of the microgroove on the capillary force.