Vibrated substrates are useful tools to move and reshape drops. Experiments usually involve periodical excitation at small amplitude but new effects can be generated by using larger and/or quicker movements. Recently, impulsive motion of a plate has been shown to enhance drop takeoff. In this article we discuss the beautiful, elusive shapes obtained when a water droplet deposited on a nonwetting substrate is subjected to a strong vertical impulse. Drops are highly reshaped to form truncated cones that eventually collapse. We report and discuss the evolution of the geometrical features of these so-called “vase-shaped droplets”. Our understanding of the physical phenomena at stake in the experiment allows us to model the evolution of the shape of the droplet. In particular, we show that the top and the bottom of the vase follow dynamics with different timescales, leading to the truncated cone shape. We show that it is possible to play with one of these dynamics by changing the wetting of the liquid on the rising substrate, and are thus able to change the shape of the vase from cylindrical to completely flat.

中文翻译：

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花瓶状液滴的形成

振动的基材是用于移动和重塑水滴的有用工具。实验通常涉及小幅度的周期性激励，但是通过使用较大和/或较快的运动可以产生新的效果。最近，已经证明板的脉冲运动增强了液滴的起飞。在本文中，我们讨论了当沉积在非湿润基材上的水滴受到强烈的垂直冲击时所获得的美丽，难以捉摸的形状。水滴高度重整，形成截头圆锥体，最终塌陷。我们报告并讨论了这些所谓的“花瓶状液滴”的几何特征的演变。我们对实验中所涉及的物理现象的理解使我们能够对液滴形状的演变进行建模。尤其是，我们显示花瓶的顶部和底部遵循不同时间尺度的动态变化，导致截锥形状。我们表明，可以通过改变上升的基板上液体的润湿性来发挥这些动力学中的一种，从而能够将花瓶的形状从圆柱形更改为完全平坦。