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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Numerical study of liquid film rupture after droplet spreading on a superhydrophilic surface
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Numerical study of liquid film rupture after droplet spreading on a superhydrophilic surface

机译：APS-APS流体动力学分部第70届年会-事件-液滴在超亲水表面扩散后液膜破裂的数值研究

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摘要

When a droplet impacts onto a solid surface, different outcomes can be observed, such as rebound, spreading and splashing. We present numerical simulation results on liquid film rupture after spreading of a droplet impact on a smooth superhydrophilic surface. The Navier-Stokes equations are solved using the variable density pressure projection method and the moment-of-fluid method is used to track the droplet interface. A superhydrophilic or superwetting surface has strong affinity to liquid and we assume the contact angle between solid and liquid is almost zero degree. The droplet spreading and film rupture process occurs in two stages: the droplet first spreads onto the surface and flattens into a thin film as it reaches the maximum diameter, then the film rim becomes unstable and the film rupture initiates from the rim toward the center gradually until the entire film breaks up into secondary droplets. The duration of the film rupture stage is much shorter than the spreading stage. The simulation result is compared with experiment and good agreement is achieved. We investigate the film thickness evolution during spreading and the effect of surface wettability on film rupture.
机译：当液滴撞击到固体表面时，可以观察到不同的结果，例如反弹，扩散和飞溅。我们提出了数值模拟结果，表明液滴在光滑的超亲水表面上散布开来后破裂。使用变密度压力投影法求解Navier-Stokes方程，并使用矩量法跟踪液滴界面。超亲水或超湿表面对液体具有很强的亲和力，我们假设固体和液体之间的接触角几乎为零度。液滴扩散和膜破裂过程分为两个阶段：液滴首先扩散到表面并在达到最大直径时变平为薄膜，然后膜边缘变得不稳定，并且膜破裂从边缘开始逐渐向中心破裂直到整个薄膜分解成次级液滴。膜破裂阶段的持续时间比铺展阶段短得多。将仿真结果与实验结果进行比较，取得了较好的一致性。我们研究了铺展过程中膜厚度的变化以及表面润湿性对膜破裂的影响。

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