结构表面水蒸气凝结分子动力学模拟  

A Molecular Dynamic Simulation Study of Water Vapor Condensation on Textured Surface

作　　者：高山[1] 刘伟[1] 刘志春[1] GAO Shan LIU Wei LIU Zhi-Chun(School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Chin)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《工程热物理学报》2017年第8期1772-1776,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376069);国家重点基础研究发展计划(No.2013CB228302)

摘　　要：近年来,有很多关于液滴在不同结构表面上的润湿过程的微观尺度研究,但是在结构表面上的凝结过程研究却很少。本文使用分子动力学模拟了水滴的动态润湿过程和水蒸气在具有不同结构参数的硅表面上的凝结过程。结果表明,不论是光滑表面还是具有纳米结构的表面,液滴在表面上最终都会呈现出球缺形状态。除此之外,气态水分子在结构间隙小的表面上倾向于在结构顶部聚集,而在结构间隙大的表面上倾向于在结构底部聚集。In recent years, a lot of researches were carried out on the wetting process of d~＇oplet on various textured surfaces at the micro-scale level, there are very few reports on the simulation study of condensation process on patterned surfaces. This paper report numerical studies on water droplet＇s dynamic wetting behavior and the process of water molecules condensing on silicon surface, with different pillar structure parameters by molecular dynamic simulation. It is found that droplets exhibit a spherical shape whether on a smooth surface or on a rough surface with nanostructure,except that, gaseous water molecules tend to gather on the top of pillars to form clusters wtmn the structure gap is small and tend to gather at the bottom of pillars when the structure gap is large.

关 键 词：结构表面 润湿 凝结 分子动力学 

分 类 号：O647[理学—物理化学]