下降(电信)
跌落冲击
坠落(事故)
机械
惯性
润湿
材料科学
韦伯数
影响
表面张力
跳跃
物理
经典力学
复合材料
热力学
湍流
电信
环境卫生
雷诺数
医学
量子力学
计算机科学
作者
Bin Zhang,Vatsal Sanjay,Songlin Shi,Yinggang Zhao,Cunjing Lv,Xiqiao,Detlef Lohse
标识
DOI:10.1103/physrevlett.129.104501
摘要
A falling liquid drop, after impact on a rigid substrate, deforms and spreads, owing to the normal reaction force. Subsequently, if the substrate is non-wetting, the drop retracts and then jumps off. As we show here, not only is the impact itself associated with a distinct peak in the temporal evolution of the normal force, but also the jump-off, which was hitherto unknown. We characterize both peaks and elucidate how they relate to the different stages of the drop impact process. The time at which the second peak appears coincides with the formation of a Worthington jet, emerging through flow-focusing, and it is independent of the impact velocity. However, the magnitude of this peak is dictated by the drop's inertia and surface tension. We show that even low-velocity impacts can lead to a surprisingly high peak in the normal force, namely when a more pronounced singular Worthington jet occurs due to the collapse of an air cavity in the drop.
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