湿润转变对超疏水表面上撞击液滴结冰影响的研究进展及展望  

Research progress and outlook of the effect of wetting transition on the freezing of impinging droplets on superhydrophobic surfaces

作　　者：张本熙 叶晋生 张研毅 余欣雨 何鑫 杨燕茹 王晓东[1,2] Benxi Zhang;Jinsheng Ye;Yanyi Zhang;Xinyu Yu;Xin He;Yanru Yang;Xiaodong Wang(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;Research Center of Engineering Thermophysics,North China Electric Power University,Beijing 102206,China;School of New Energy,North China Electric Power University,Beijing 102206,China;School of Power Energy and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学,新能源电力系统国家重点实验室,北京102206 [2]华北电力大学工程热物理研究中心,北京102206 [3]华北电力大学新能源学院,北京102206 [4]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《科学通报》2023年第2期142-153,共12页Chinese Science Bulletin

基　　金：国家自然科学基金(51936004,51821004);中央高校基本科研业务费专项资金(2022MS032)资助。

摘　　要：表面超疏水性是液滴撞击固体表面反弹的基础,利用超疏水表面的液滴反弹特性可从源头上抑制撞击液滴结冰,但湿润转变的发生会使表面的超疏水性失效.本文重点关注湿润转变对超疏水表面上撞击液滴结冰的影响.首先,分别从湿润转变对表面上撞击液滴动力学行为的影响、湿润转变对撞击液滴结冰形式的影响和撞击液滴湿润转变遵循的能量路径及转变机理3个方面梳理当前研究现状.然后,在总结上述研究现状的基础上,对通过表面微结构拓扑设计,实现抑制Cassie-Wenzel不可逆湿润转变,促进Cassie-Wenzel-Cassie可逆湿润转变,以此强化超疏水表面的液滴反弹特性进而抑制撞击液滴结冰的新思路进行了展望.Freezing of impinging droplets widely appears in industrial applications,such as energy power,electric communications,aerospace,and many others,which seriously interferes with equipment operation.Due to this fact,how to inhibit the impinging droplet freezing is of great significance in practical applications.It is worth recalling that the droplet bounces off surfaces as it impacts on superhydrophobic surfaces,and hence the impinging droplet freezing is thoroughly inhibited by the rebound characteristics of superhydrophobic surfaces.However,superhydrophobicity is the basis for droplet rebound.As the Cassie-Wenzel irreversible wetting transition is triggered by droplet impact,this irreversible wetting transition causes the failure of superhydrophobicity such that droplets adhere to and freeze on cold superhydrophobic surfaces.As a result,from the viewpoint of wetting transition,how to enhance the rebound characteristics of superhydrophobic surfaces is essential to inhibit the impinging droplet freezing.This paper provides a review on the influence of wetting transition on the impinging droplet freezing on superhydrophobic surfaces,ranging from its effect on dynamic behaviors,its effect on freezing forms to energy paths and transition mechanisms for impact-induced wetting transition.Based on this review,it is found that as droplets impact on superhydrophobic surfaces,it can bounce off only when the Cassie-Wenzel irreversible wetting transition is not triggered,or Cassie-Wenzel-Cassie reversible wetting transition is triggered.Secondly,when the impinging droplet adheres to the cold superhydrophobic surface,the impinging droplet freezes in the form of the Wenzel state as the Cassie-Wenzel irreversible wetting transition is thoroughly triggered,in the form of the partial Wenzel state as the Cassie-Wenzel wetting transition or the Wenzel-Cassie dewetting transition is partially triggered,and in the form of the Cassie state as the Cassie-Wenzel-Cassie reversible wetting transition is triggered.Compared with the partial W

关 键 词：超疏水性 撞击液滴 湿润转变 液滴结冰 退湿转变 

分 类 号：O35[理学—流体力学] TK124[理学—力学] TM75[动力工程及工程热物理—工程热物理]