仿生叶脉分形微结构表面的平板热管传热性能研究

Heat transfer performance of flat-plate heat pipe with bionic vein microstructure surface

中文关键词: 平板热管  仿生叶脉  充液率  分形角度

英文关键词: Flat-plate heat pipe  Bionic vein  Filling ratio  Fractal angle

中文摘要:

      基于植物叶片的蒸腾作用，以叶脉结构作为蓝本，设计了分形角度为50°、60°、70°、80°、90°的仿叶脉槽道结构，并将其应用于平板热管冷凝端。其中上一级槽道与下一级槽道的长度比、宽度比均为0.7，第一级槽道长度为16.0mm,宽度为2.0mm,深度为0.3mm，并且设置一组未经表面处理的平板热管作为对照。实验结果表明，分形角为80°时性能最优，其冷凝热阻最小可达39.42℃/KW，相比未经表面处理平板热管的热阻降低了40.29%;相对于传统的直槽道结构，置于冷凝端的仿叶脉槽道结构能极大地降低工质流阻，有利于工质回流。

英文摘要:

      A new flat-plate heat pipe with vein structure grooves is proposed. Different fractal angle (50°, 60°, 70°, 80° and 90°) of the vein structure are examined. The size of the vein structure groove is decreasing along radial direction. Both the length and width ratio of the downstream groove to upstream groove is 0.7. The central groove has a length of 16.0mm, a width of 2.0mm, and a depth of 0.3mm. A comparison study of a flat-plate heat pipes without surface treatment is also made. The results show that the most optimal fractal angle of the vein structure is 80°. When the heat pipe has the smallest condensation thermal resistance of 39.42℃/KW, 40.29% lower than the untreated flat-plate heat pipe. Compared with traditional straight channel structure, the venous channel structure also greatly reduce flow resistance, which is conducive to the return of the working fluid.