Instability of a liquid jet emerging from a droplet upon collision with a solid surface
Instability of a liquid jet emerging from a droplet upon collision with a solid surface
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DOI：
10.1063/1.870259
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发表时间：
2000-03-01
影响因子：
4.6
通讯作者：
Chun, JH
中科院分区：
文献类型：
--
作者：
Kim, HY;Feng, ZC;Chun, JH
本文发展了一种线性扰动理论来研究圆柱形内径向膨胀液体射流的界面不稳定性。该理论被应用于与固体表面碰撞后快速扩散的液滴作为飞溅背后的基本机制。分析是基于观察到的液体片的不稳定性，即，在液滴碰撞的极早期阶段，在扩展前沿形成指状物。基于理论模型得到的轴对称解，数值模拟了扩散初期界面的形状演化。的影响，如界面半径的瞬态剖面，扰动开始时间，和韦伯数的分析结果的因素进行检查。这项研究表明，一个大的冲击惯性，与高韦伯数，促进界面的不稳定性，并倾向于高波数最大的不稳定性。该模型预测的液滴扩展前沿的指状物数量与实验观察到的一致。(C)2000年美国物理学会。【S1070-6631（00）00503-1】。
A linear perturbation theory is developed to investigate the interface instabilities of a radially-expanding, liquid jet in cylindrical geometries. The theory is applied to rapidly spreading droplets upon collision with solid surfaces as the fundamental mechanism behind splashing. The analysis is based on the observation that the instability of the liquid sheet, i.e., the formation of the fingers at the spreading front, develops in the extremely early stages of droplet impact. The shape evolution of the interface in the very early stages of spreading is numerically simulated based on the axisymmetric solutions obtained by a theoretical model. The effects that factors such as the transient profile of an interface radius, the perturbation onset time, and the Weber number have on the analysis results are examined. This study shows that a large impact inertia, associated with a high Weber number, promotes interface instability, and prefers high wave number for maximum instability. The numbers of fingers at the spreading front of droplets predicted by the model agree well with those experimentally observed. (C) 2000 American Institute of Physics. [S1070-6631(00)00503-1].