Abstract

For the first time, photo and video detection is carried out for all groups of small droplets (splashes) emitted when a drop of \(0.2 < D < 0.5\) cm in diameter falls with a velocity of \(1 < U < 4.05\) m/s into a pool with water. In the splash-formation mode, groups of droplets are ejected in echelons first from the tops of spikes on the veil around the primary contact area, then, from the spikes on the edges of the split shells of the crown, and, finally, from the teeth of its chevron. The first splashes fly out radially, and the next move inward around the cavity and vertically upward. The splash sizes grow with time from 0.1 to 1.0 mm. Their velocities decrease from 20 to 1 m/s, and the intervals between groups increase from 50 μs to 2.5 ms until the beginning of smoothing of the crown teeth (\(t \approx 17\) ms). The acceleration of the droplets is facilitated by the conversion of the available potential energy when the free surfaces of the merging droplets are annihilated.

中文翻译：

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跌落冲击时多次飞溅

摘要

首次对所有直径为\（0.2 <D <0.5 \） cm的液滴以\（1 <U <4.05）的速度下降时发出的所有小液滴（飞溅）组进行照片和视频检测\）m / s倒入水池中。在飞溅形成模式中，成组的液滴首先从围绕主接触区域的面纱上的尖峰顶部喷出，然后从冠部裂开的贝壳边缘上的尖峰喷出，最后从顶部喷出。人字形的牙齿。第一个飞溅物沿径向飞出，第二个飞溅物围绕空腔向内移动并垂直向上移动。飞溅大小随时间从0.1毫米增加到1.0毫米。它们的速度从20 m / s降低到1 m / s，并且组之间的间隔从50μs增加到2.5 ms，直到开始冠状牙齿变光滑为止（\（t \ approx 17 \） ms）。当合并液滴的自由表面被歼灭时，可用势能的转换促进了液滴的加速。