Early stage of nanodroplet impact on solid wall
Early stage of nanodroplet impact on solid wall
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DOI：
10.1063/1.4942874
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发表时间：
2016-03
影响因子：
4.6
通讯作者：
K. Kobayashi;Kazuki Konno;H. Yaguchi;H. Fujii;T. Sanada;Masao Watanabe
中科院分区：
文献类型：
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作者：
K. Kobayashi;Kazuki Konno;H. Yaguchi;H. Fujii;T. Sanada;Masao Watanabe
在这项研究中，我们利用分子动力学模拟研究了纳米液滴在撞击后早期的扩散，通过改变液体和壁面分子之间的分子间力的大小。结果表明，液滴在碰撞后的变形很大程度上取决于分子间的作用力。通过在壁面附近的几个分子层的圆柱形控制体积来测量扩散直径的时间演变。在纳米液滴撞击初期，液滴的归一化扩散半径与归一化时间的平方根成正比。Rioboo等人提出的几何考虑可以理解这一结果[“液滴撞击固体干燥表面的时间演变”，《流体实验》33,112-124(2002)]。此外，我们还发现，随着液体与壁面之间的分子间作用力越来越强，壁面上第一分子层的归一化扩散直径对壁面的依赖程度越来越小。
In this study, we investigated nanodroplet spreading at the early stage after the impact using molecular dynamics simulations by changing the magnitude of the intermolecular force between the liquid and wall molecules. We showed that the droplet deformation after the impact greatly depends on the intermolecular force. The temporal evolution of the spreading diameters was measured by the cylindrical control volume for several molecular layers in the vicinity of the wall. At the early stage of the nanodroplet impact, the normalized spreading radius of the droplet is proportional to the square root of the normalized time, tˆ. This result is understood by the geometrical consideration presented by Rioboo et al. [“Time evolution of liquid drop impact onto solid, dry surfaces,” Exp. Fluids 33, 112–124 (2002)]. In addition, we found that as the intermolecular force between the liquid and wall becomes stronger, the normalized spreading diameter of the first molecular layer on the wall remains less dependent on th...