Droplet-air collision dynamics: Evolution of the film thickness
Droplet-air collision dynamics: Evolution of the film thickness
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DOI：
10.1103/physreve.89.013023
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发表时间：
2014-01-28
影响因子：
2.4
通讯作者：
Tropea, C.
中科院分区：
文献类型：
--
作者：
Opfer, L.;Roisman, I. V.;Tropea, C.
本研究致力于空气动力学液滴破碎现象的实验和理论研究。我们表明，下降到一个刚性的墙上，下降二进制碰撞，和空气动力学下降变形的现象是相似的，如果正确的缩放。然后，我们使用变形液滴的观察来估计袋的膜厚度的演变，该值确定由袋破裂产生的细子液滴的大小。这种预测的膜厚度，基于膜运动学，验证了初始阶段的直接下降的厚度测量，并在最后阶段的孔扩张的速度在膜中获得的数据。结果表明，薄膜厚度与袋顶点的无量纲位置相关。
This study is devoted to the experimental and theoretical investigation of aerodynamic drop breakup phenomena. We show that the phenomena of drop impact onto a rigid wall, drop binary collisions, and aerodynamic drop deformation are similar if the correct scaling is applied. Then we use observations of the deforming drop to estimate the evolution of the film thickness of the bag, the value that determines the size of the fine child drops produced by bag breakup. This prediction of film thickness, based on film kinematics, is validated for the initial stage by direct drop thickness measurements and at the latest stage by the data obtained from the velocity of hole expansion in the film. It is shown that the film thickness correlates well with the dimensionless position of the bag apex.