过冷水滴结冰再辉过程对超疏水表面防结冰稳定性的影响
结题报告
批准号:
12002282
项目类别:
青年科学基金项目
资助金额:
24.0 万元
负责人:
宋东
依托单位:
学科分类:
多相流、渗流与非牛顿流体力学
结题年份:
2023
批准年份:
2020
项目状态:
已结题
项目参与者:
宋东
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中文摘要
低温超疏水表面与水接触时能在表面微纳米结构内封存一层气膜,达到主动防结冰效果,在航空、列车、电力输送等领域应用前景广阔。然而超疏水表面在过冷水滴结冰过程中稳定性极低,其破坏机制尚不明确,是亟待揭示的科学难题。本项目拟采用多种手段探索过冷水滴结冰过程中最为复杂的再辉过程对超疏水表面稳定性的影响:①利用高速成像技术探究超疏水表面微纳米结构对过冷水滴再辉过程的影响规律,实现对再辉过程中临界过冷度、初始晶核位置等的操控;②利用具有纳米精度的冷冻扫描电镜技术,从微观角度揭示再辉现象中水气挥发过程导致的表面微纳米结构内部冰晶生长过程及其形态分布规律,阐明超疏水表面在过冷条件下的防结冰失效机理;③采用分子动力学方法从分子层面揭示过冷水滴再辉过程及其伴随的气体挥发现象的物理机理,和该过程对纳米结构超疏水表面稳定性的负面影响机制。为设计制备稳定的防结冰超疏水微纳米结构涂层提供理论指导和技术支撑。
英文摘要
A thin layer of gas film can be trapped within the micro/nano structures of a cold superhydrophobic surface, which promises the icephobic applications in the fields of the airplane, trains, electric power transmission and so on. However, the icephobicity of the superhydrophobic surfaces is unstable when they come into contact with the super-cooled water. Along with worldwide concerns, nevertheless, it has not been fundamentally clarified the mechanism of the degeneration of icephobicity during the freezing process of the super-cooled water. The objective of this research is to establish a fundamental understanding of the correlation between the recalescence process, the most complex process during the freezing of a super-cooled droplet, and the stability of the superhydrophobic surfaces, by the means of experimental investigations, molecular dynamics simulations as well as theoretical analysis. For the experiments, a highspeed camera system will be used to capture the recalescence process on a superhydrophobic surface with micro/nano structures, based on which the effect of the surface roughness onto the degree of supercooling, the position of the first nucleus of crystallization, the shape and direction of the freezing front, etc., will be obtained and analyzed. A Cryo-SEM system (Scanning Electron Cryomicroscopy), with a resolution of tens of nanometers that is two orders of magnitudes finer than the ESEM (Environmental Scanning Electron Microscopy), will be applied to directly observe the shape of the nano-sized ice crystals that condensed within the spaces between the micro/nano structures, based on which the failure mechanism of the icephobicity of the superhydrophobic surfaces due to the evaporation and condensation phenomenon resulted from the recalescence process will be obtained. The freezing process of the super-cooled droplet will be simulated via the molecular dynamics simulations and the physical explanation of the recalescence process, along with the evaporation mechanism during the recalescence, will be achieved. The methods and approaches to be used will lead to a new and deep understanding of the critical surface parameters impacting icephobic efficiency and durability which will benefit the optimization of the superhydrophobic surface parameters in the field of anti-icing applications.
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Splitting an Impacting Droplet by a Superhydrophobic Wire
通过超疏水线分裂撞击的液滴
DOI:10.3390/coatings12121866
发表时间:2022-12-01
期刊:COATINGS
影响因子:3.4
作者:Song,Dong;Xu,Changsheng;Choi,Chang-Hwan
通讯作者:Choi,Chang-Hwan
DOI:10.1063/5.0123371
发表时间:2022
期刊:Physics of Fluids
影响因子:--
作者:Pengcheng Gao;Qiaogao Huang;Guang Pan;Yunlong Ma;Dong Song
通讯作者:Dong Song
DOI:--
发表时间:2023
期刊:Coatings
影响因子:3.4
作者:Dong Song;Xin Liu;Xiang Wang;Xiaoxu Du;Haibao Hu
通讯作者:Haibao Hu
国内基金
海外基金