疏水表面的融霜排液特性研究  

Defrosting and Drainage Characteristics of Hydrophobic Surfaces

作　　者：吴晓敏[1] 褚福强[1] 陈永根[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室北京市CO_2资源利用与减排技术重点实验室,北京100084

出　　处：《工程热物理学报》2015年第6期1345-1348,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51476084);清华大学自主科研计划(No.20131089319)

摘　　要：本文利用化学刻蚀和硅氟烷修饰的方法制备了具有微纳二级结构的铝基疏水表面,实验研究了自然对流条件下疏水表面的融霜排液特性,观察了疏水表面上融霜过程,并分析了表面特性和结霜时间对融霜排液的影响。结果表明:水平放置的疏水表面融霜过程可分为霜晶融化、液膜形成与合并、液膜运动与收缩三个阶段;结霜工况与结霜时间相同时,竖直放置的裸铝表面、114°和145°疏水表面中,145°疏水表面融霜后的残留液量最少;结霜工况与表面特性相同时,结霜时间越长,融霜排液后的残留液量越小。Hydrophobic surfaces were fabricated with chemical etching and fluorosilane modification methods on Al substrates.The defrosting and drainage characteristics of hydrophobic surface under natural convection were studied in this paper.The process of defrosting and drainage was observed and the influence of surface characteristics and frosting time on defrosting and drainage was also analyzed in the experiment.The results show that:the defrosting process of horizontal placed hydrophobic surface can be divided into three stages:frost crystal melting,meltwater film formation and mergence,meltwater film movement and shrink;when the frosting conditions and frosting time are the same,145° hydrophobic surface has the least amount of residual liquid among vertical placed bare aluminum surface,114° and 145° hydrophobic surface;when the frosting conditions and surface characteristics are the same,surface with the longest frosting time has the least amount of residual liquid after defrosting and drainage.

关 键 词：疏水表面 融霜 排液 

分 类 号：O647.1[理学—物理化学]