新型微小尺度肋片的表面排水性能研究

Study on surface drainage performance of a novel microscale fin

为提升空调换热器肋片表面的排水性能,提出了1种新型的百叶窗式微小尺度肋片结构,通过构建不连续的粗糙表面,增加液滴自由延展的能量障碍,从而减小固液接触面积以及相应的排水阻力。对新型微小尺度肋片表面的水滴受力情况进行定性分析,从理论层面论证其排水性能的增强,并提出最佳叶面宽度的判断依据。为验证理论,进一步开展了滴水和凝水实验,分别测试肋片样品对应的临界角与表面凝结水量,判断肋片的最佳叶面宽度。实验结果表明:新型微小尺度肋片能有效减少表面凝结水的滞留量,且对不同实验材料存在最佳的肋片叶面宽度,使得表面凝结水滞留量最小。

In order to improve the drainage performance of the evaporator surface,a novel microscale fin structure was proposed.By constructing a discontinuous rough surface,the free ductile energy barrier of the droplets is increased,thus reducing the contact area of solid and liquid and the corresponding drainage resistance.The force condition of water droplet on the surface of a new micro scale fin is qualitatively analyzed.The enhancement of the drainage performance is demonstrated from the theoretical level,and the judgment basis for determining the optimum width of the leaf surface is proposed..In order to verify the theory,experiments of dropping and condensing are carried out.The critical angle and the surface condensation water of the fin sample are tested respectively,and the best width of the rib is determined.The experiment results show that the novel microscale fin structure is effective in enhancing drainage performance and the optimal width exists based on surfaces with different materials,making the minimum retention of the surface condensate.