Evolution of the fingering pattern of an impacting drop
Evolution of the fingering pattern of an impacting drop
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DOI：
10.1063/1.869661
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发表时间：
1998-05
影响因子：
4.6
通讯作者：
S. Thoroddsen;J. Sakakibara
中科院分区：
文献类型：
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作者：
S. Thoroddsen;J. Sakakibara
水滴对固体表面的冲击会产生沿着表面传播的快速膨胀的细流。我们研究了水滴撞击玻璃板期间喷射边缘的指法模式的演变。多重闪光摄影显示，在扩张过程中，正面形状发生了系统性变化。最初的手指变宽并分成两部分。在许多情况下，这种分裂仅限于每个手指上形成双峰。两个这样的相邻起伏的后续相互作用通常会导致合并，从而产生三个明显的手指。尽管额叶形状发生了显着变化，但基本波动的数量在扩张过程中保持大致恒定。这些方位角扰动的根源在第一次接触时就被观察到。提出了一些基于毛细波的启发式论证来解释分裂和合并。这项研究的主要重点是雷诺数约为 15 000 的影响，b...
The impact of a drop on a solid surface generates a rapidly expanding thin jet traveling along the surface. We study the evolution of the fingering pattern at the edge of this jet during the impact of a water drop on a glass plate. Multiple-flash photography shows that systematic changes in frontal shapes take place during the expansion. The initial fingers widen and split in two. This splitting is in many cases limited to the development of a double peak on each finger. The subsequent interaction of two such adjacent undulations often results in merging which produces three pronounced fingers. Despite the significant changes in the frontal shapes, the number of fundamental undulations remains approximately constant during the expansion. The progenitors of these azimuthal disturbances are observed right at first contact. Some heuristic arguments based on capillary waves are put forth to explain the splitting and merging. The main focus of this study is on impacts having Reynolds numbers of about 15 000, b...