Modelling of a single drop impact onto liquid film using particle method
Modelling of a single drop impact onto liquid film using particle method
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DOI：
10.1002/fld.736
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发表时间：
2004-07
影响因子：
1.8
通讯作者：
Heng Xie;S. Koshizuka;Y. Oka
中科院分区：
文献类型：
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作者：
Heng Xie;S. Koshizuka;Y. Oka
采用移动粒子半隐式方法对单液滴撞击薄液面的过程进行了数值模拟。数学模型涉及重力、粘度和表面张力。通过对实验案例的仿真验证了该模型的有效性。结果表明，冲击后的动力学过程对液池深度和液滴初速度敏感。在液滴初始速度较低的情况下，液滴将与液池合并，不会出现大的飞溅。如果液滴初始速度足够高，则动态过程取决于液体深度。如果液膜非常薄，撞击后会立即形成碗状的薄冠。整个树冠随后向外扩张，并破裂成许多微小的液滴。当液膜厚度增加时，液冠的方向变为垂直于表面，并且液冠向外传播。我们还发现，树冠的半径可以用时间的平方函数来描述：rC = [c（t-t0）]0.5。当液膜足够厚时，撞击后不久就会形成一个冠状结构和一个很深的空洞。空腔的底部最初是扁圆的，然后基部向下生长以形成尖角，随后角部向下移动。版权所有© 2004年约翰威利父子有限公司。
The process of single liquid drop impact on thin liquid surface is numerically simulated with moving particle semi‐implicit method. The mathematical model involves gravity, viscosity and surface tension. The model is validated by the simulation of the experimental cases. It is found that the dynamic processes after impact are sensitive to the liquid pool depth and the initial drop velocity. In the cases that the initial drop velocity is low, the drop will be merged with the liquid pool and no big splash is seen. If the initial drop velocity is high enough, the dynamic process depends on the liquid depth. If the liquid film is very thin, a bowl‐shaped thin crown is formed immediately after the impact. The total crown subsequently expands outward and breaks into many tiny droplets. When the thickness of the liquid film increases, the direction of the liquid crown becomes normal to the surface and the crown propagates outward. It is also found that the radius of the crown is described by a square function of time: rC = [c(t − t0)]0.5. When the liquid film is thick enough, a crown and a deep cavity inside it are formed shortly after the impact. The bottom of the cavity is initially oblate and then the base grows downward to form a sharp corner and subsequently the corner moves downward. Copyright © 2004 John Wiley & Sons, Ltd.