Propagation of a kinematic instability in a liquid layer: capillary and gravity effects.
Propagation of a kinematic instability in a liquid layer: capillary and gravity effects.
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DOI：
10.1103/physreve.77.046305
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发表时间：
2008-04
期刊：
影响因子：
--
通讯作者：
I. Roisman;N. V. van Hinsberg;C. Tropea
中科院分区：
文献类型：
--
作者：
I. Roisman;N. V. van Hinsberg;C. Tropea
在本实验和理论研究中，研究了有限厚度液层上的单滴撞击。它的重点是形成，膨胀，后退，并合并的影响所产生的空腔。在撞击后的不同时间观察空洞的形状并测量其直径的变化。在实验中改变了液滴速度、初始膜厚和液体性质。采用运动学不连续方法，从理论上描述了弹坑直径在液层中的传播。液体层的质量和动量平衡方程考虑了惯性效应、表面张力和重力。一个远程渐近解的陨石坑直径的时间演变。理论预测与实验数据吻合较好。
In this experimental and theoretical study a single drop impact onto a liquid layer of finite thickness is investigated. It is focused on the formation, expansion, receding, and merging of a cavity generated by the impact. The shape of the cavity is observed and the evolution of its diameter is measured at various times after impact. The drop velocity, the initial film thickness, and the liquid properties are varied in the experiments. The propagation of the crater diameter in the liquid layer is described theoretically using the kinematic discontinuity approach. The mass and momentum balance equations of the liquid layer account for the inertial effects, surface tension, and gravity. A remote asymptotic solution for the temporal evolution of the crater diameter is obtained. The theoretical predictions agree well with the experimental data.