ABSTRACT Molecular dynamics simulation is conducted to study the effects of surface wettability on rapid boiling and bubble nucleation over smooth surface. The simple L-J liquid is heated by smooth metal surface with different conditions of wettability in cuboid simulation box. The results show that surface wettability has significant impact on phase transition of liquid film. When the heating temperature is 200 K, the rapid boiling occurs above strongly hydrophilic and weakly hydrophilic surfaces; however, only slow evaporation phenomenon occurs above weakly hydrophobic surface within 2.5-ns simulation time. The reason is that the interaction between argon and platinum atoms is stronger over hydrophilic surface, which has higher efficiency in heat transfer. Furthermore, based on the difference of surface wettability in heat transfer efficiency, the surface with nonuniform wettability is constructed, and the central region is more hydrophilic than surrounding region. The growing process of bubble nucleus can be completely observed above the more hydrophilic region.

中文翻译：

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表面润湿性对快速沸腾和气泡成核的影响：分子动力学研究

摘要 进行分子动力学模拟以研究表面润湿性对光滑表面上快速沸腾和气泡成核的影响。简单的LJ液体在长方体模拟箱中被具有不同润湿条件的光滑金属表面加热。结果表明，表面润湿性对液膜的相变有显着影响。当加热温度为200 K时，在强亲水和弱亲水表面上方发生快速沸腾；然而，在 2.5 纳秒的模拟时间内，仅在弱疏水表面上方发生缓慢蒸发现象。原因是氩和铂原子之间的相互作用在亲水表面上更强，传热效率更高。此外，基于传热效率的表面润湿性差异，构造润湿性不均匀的表面，中心区域比周围区域更亲水。在更亲水的区域上方可以完全观察到气泡核的生长过程。