凝结初期固体表面纳米液滴尺寸分布特征  

Size Distribution of Nano-droplets on Solid Walls During Initial Condensation

作　　者：颜笑[1] 陈凤[1] 张勤昭[1] 黄志勇[1] 薄涵亮[1] 

机构地区：[1]清华大学核能与新能源技术研究院,先进核能技术协同创新中心,先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《工程热物理学报》2016年第5期1046-1049,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金青年科学基金项目(No.51206092);清华大学自主科研基金项目(No.2014Z21022)

摘　　要：研究凝结初期纳米液滴在固体表面纳米液滴的尺寸分布特征,不仅有助于揭示纳米结构表面凝结换热的微观机理,同时还可为纳米结构表面的设计提供参考依据。借助分子动力学模拟,考察了体系温度、固体表面亲水性对光滑和纳米方柱结构表面纳米液滴尺寸分布特征的影响。结果表明:系统温度升高,表面大液滴比例降低,表面液滴覆盖率下降;表面亲水性增强,表面大液滴比例增加,表面液滴覆盖率增加;纳米结构表面相对光滑表面更易出现小尺寸液滴。The size distribution of nano-droplets on solid walls during initial condensation is vital to revealing the microscopic mechanism of heat transfer,and is also the basis of design criteria of nano-structures on condescending surfaces.By molecular dynamics simulations,the effects of system temperature and surface hydrophihcity on the size distribution of nano-droplets upon smooth and nano-pillared surfaces were investigated.Simulation results show that with the increase of system temperature and decrease of surface hydrophihcity,the proportion of large droplets and surface droplet-coverage drops;small droplets are more likely to exist on nano-structured surfaces.

关 键 词：凝结初期 纳米液滴 纳米结构表面 液滴尺寸分布 分子动力学模拟 

分 类 号：TK421.42[动力工程及工程热物理—动力机械及工程]