Spreading dynamics of a droplet impacting a sphere
Spreading dynamics of a droplet impacting a sphere
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DOI：
10.1063/5.0120642
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发表时间：
2022-08
影响因子：
4.6
通讯作者：
Ming Long;Jalil Hasanyan;Sunghwan Jung
中科院分区：
文献类型：
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作者：
Ming Long;Jalil Hasanyan;Sunghwan Jung
在自然界中，高速雨滴经常撞击和扩散到树叶等曲面上。虽然对表面的跌落冲击是工业应用的一个传统主题，但对自然情况下曲面上的跌落冲击动力学却知之甚少。在目前的研究中，我们研究了液滴在曲面疏水表面上的随时间变化的扩散动力学。我们还观察到，曲面上的水滴比平面上的水滴扩散得更远。为了了解扩散动力学，基于体积守恒和时间能量平衡建立了一个新的分析模型。该模型在液滴撞击的早期和最后阶段收敛于以前的模型。我们将新模型与不同曲面和不同撞击速度下的测量扩展长度进行了比较，结果吻合较好。
In nature, high-speed rain drops often impact and spread on curved surfaces e.g. tree leaves. Although a drop impact on a surface is a traditional topic for industrial applications, drop-impact dynamics on curved surfaces in natural situations are less known about. In the present study, we examine the time-dependent spreading dynamics of a drop onto a curved hydrophobic surface. We also observed that a drop on a curved surface is spreads farther than one on a flat surface. To understand the spreading dynamics, a new analytical model is developed based on volume conservation and temporal energy balance. This model converges to previous models at the early stage and in the final stage of droplet impact. We compared the new model with measured spreading lengths on various curved surfaces and impact speeds, which resulted in good agreement.