铝基超疏水表面凝露初期的实验研究  

Experimental Study on Initial Morphology of Condensation on Aluminum Based Super-hydrophobic Surface

作　　者：武卫东[1] 吕婉豆 汪德龙[1] WU Weidong;Lü Wandou;WANG Delong(Institute of Refrigeration and Cryogenics Engineering, University of Shanghai for Science and Technology,Shanghai 200093, China)

机构地区：[1]上海理工大学制冷与低温工程研究所,上海200093

出　　处：《制冷技术》2017年第1期13-17,共5页Chinese Journal of Refrigeration Technology

摘　　要：本文以铝基体超疏水表面为研究对象,分别基于5℃、10℃和15℃的基底温度,利用高速动态记录仪观测了表面凝露初期阶段液滴的生成及凝并过程,并通过图片像素计算了液滴直径,进行了相应的疏水性能评价。结果表明:在实验基底温度范围内,超疏水表面凝露初期,凝结液滴分布稀疏,不形成连续水膜,具有良好的疏水性能;随着基底温度的降低,液滴生成速度加快、数量增多,且基底温度越低的表面越早出现液滴的凝并,凝并+后液滴趋于拥有自驱离能力,最终形成新的干表面从而保持良好疏水性能。研究结果可为超疏水性能辐射板及其表面温度工况的优化选择提供一定的参考。Based on super-hydrophobic surfaces of aluminum substrate at three different substrate temperatures of5oC,10oC and15oC,the droplet formation and coagulation process on the surfaces at early condensation stage were observed by a high-speed dynamic recorder.The diameter of droplets was calculated according to the pixel,and the hydrophobic properties were evaluated correspondingly.Experimental results show that,at early condensation stage on the super-hydrophobic surface,the condensate droplets distribute sparsely,not forming a continuous film of water,and the surface exhibits good hydrophobic properties within the studied substrate temperatures;the droplet formation rate is accelerated and the number of droplets is increasing with the decrease of substrate temperature;moreover,the droplet coagulation occurs earlier on the surface with lower substrate temperature,and the coagulated droplets tend to possess the ability of self-propelling,leading to forming the new dry surfaces and maintaining good hydrophobic properties.The research results may provide a reference for the optimal selection of super-hydrophobic radiation plate and surface temperature conditions.

关 键 词：超疏水表面 铝合金 凝露 辐射板 

分 类 号：TB64[一般工业技术—制冷工程]