Dynamics of the cavity and the surface film for impingements of single drops on liquid films of various thicknesses.
Dynamics of the cavity and the surface film for impingements of single drops on liquid films of various thicknesses.
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DOI：
10.1016/j.jcis.2010.06.015
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发表时间：
2010-10
影响因子：
9.9
通讯作者：
N. V. van Hinsberg;M. Budakli;S. Göhler;E. Berberovic;I. Roisman;T. Gambaryan-Roisman;C. Tropea
中科院分区：
文献类型：
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作者：
N. V. van Hinsberg;M. Budakli;S. Göhler;E. Berberovic;I. Roisman;T. Gambaryan-Roisman;C. Tropea
本文介绍了有限厚度液膜上的单滴撞击的实验和数值研究。对液滴撞击液体表面膜的动力学、空腔形状、表面膜动力学和剩余膜厚度进行了研究和分析。利用高速摄像系统对表面膜内的穿透空腔的形状进行了实验观察。此外，使用基于彩色共焦成像的光学传感器来实时监测扩张、后退和收缩腔与固体壁之间的液膜厚度。各种影响参数，如液滴撞击速度，液体性质（表面张力和粘度）和初始液膜厚度，对腔和膜动力学的时间演化的影响进行了研究。补充的实验直接数值模拟的下降的影响和空腔膨胀的有限体积数值方法的框架中使用的流体的自由表面捕获模型的体积。数值预测的膜厚动力学同意与实验的大多数阶段的冲击过程。最后，对不同的冲击参数进行了腔体和固体壁面之间的残余油膜厚度的比例分析。
This paper presents experimental and numerical investigations of single drop impacts onto liquid films of finite thickness. The dynamics of the drop impingement on liquid surface films, the shape of the cavity, the surface film dynamics and the residual film thickness are investigated and analysed. The shape of the penetrating cavity within the surface film is observed experimentally using a high-speed video system. Additionally, the thickness of the liquid film between the expanding, receding and retracting cavity and the solid wall is monitored in time using an optical sensor based on chromatic confocal imaging. The effects of various influencing parameters, such as the drop impingement velocity, liquid properties (surface tension and viscosity) and the initial liquid film thickness, on the time evolution of the cavity and film dynamics are investigated. Complementary to the experiments direct numerical simulations of the drop impacts and cavity expansion are performed using a volume-of-fluid free-surface capturing model in the framework of the finite volume numerical method. The numerical predictions of the film thickness dynamics agree well with the experiments for most phases of the impingement process. Finally, a scaling analysis of the residual film thickness between the cavity and the solid wall is performed for various impingement parameters.