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.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
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)
关键词
疏水表面
融霜
排液
hydrophobic surface
defrosting
drainage
