纳米混合润湿表面成核和沸腾的分子模拟  

Molecular Dynamics Simulation of Nucleation and Boiling of Water on Nanoscale Hybrid-Wettability Surface

作　　者：赵晖 周乐平[1] ZHAO Hui;ZHOU Leping(Key Laboratory of Power Station Energy Transfer Conversion and System(North China Electric Power University),Ministry of Education,School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院暨电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《工程热物理学报》2022年第5期1292-1295,共4页Journal of Engineering Thermophysics

基　　金：国家自然基金资助项目(No.51876058)。

摘　　要：本文通过分子动力学模拟方法研究了纳米混合润湿表面在瞬态变温边界条件下的气泡成核和沸腾传热特性。结果表明,气泡接触线在润湿性边界存在钉扎效应,混合润湿表面可强化气泡成核;随疏水性部分润湿性增强,组合壁面上方气泡成核类型从异相成核向均相成核转变;纳米混合润湿表面热流密度均随凹槽疏水性部分润湿性增大而减小;超亲水基底上方修饰超疏水纳米结构最有利于强化沸腾传热。论文工作可为气泡成核和沸腾传热性能的调控提供理论参考。In this paper,molecular dynamics simulation methods are used to study the bubble nucleation and boiling heat transfer characteristics of the nanoscale hybrid-wettability surface under transient temperature boundary conditions.The results show that the contact line underneath bubble has a pinning effect on the wettability boundary,and the hybrid-wettability surface can enhance the bubble nucleation.As the wettability of the hydrophobic part increases,the bubbles above the composite wall changes from heterogeneous to homogeneous nucleation.The heat flux of the nanoscale hybrid-wettability surface decreases with the increase in the wettability of the hydrophobic part of the groove.It is concluded that the superhydrophobic nanostructure on superhydrophilic substrate is most favorable for enhancing boiling heat transfer.This work provides a theoretical basis for the tuning of bubble nucleation and boiling heat transfer performance.

关 键 词：分子模拟 混合润湿性 纳米结构 气泡成核 沸腾传热 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]