沉积在光滑基底上的液滴聚结前的凹痕排水
Dimple drainage before the coalescence of a droplet deposited on a smooth substrate
摘要：
在自然界中，从泡沫到自由表面上的亚毫米气泡，薄的液体或气体膜无处不在，它们的破裂留下了小滴和气泡的集合。然而，导致这些电影爆炸的机制仍在争论中。因此，本研究的目的是了解之间的毫米液滴和光滑的固体或液体薄膜重力挤压的薄空气膜的排水动力学。求解耦合润滑方程和分析的主要条款在固体和液体膜的情况下，我们解释了为什么排水是更快的液体膜的情况下，往往导致更短的聚结时间，在最近的实验中观察到的。
英文摘要：
Thin liquid or gas films are everywhere in nature, from foams to submillimetric bubbles at a free surface, and their rupture leaves a collection of small drops and bubbles. However, the mechanisms at play responsible for the bursting of these films is still in debate. The present study thus aims at understanding the drainage dynamics of the thin air film squeezed by gravity between a millimetric droplet and a smooth solid or a liquid thin film. Solving coupled lubrication equations and analyzing the dominant terms in the solid and liquid film cases, we explain why the drainage is much faster in the liquid film case, leading often to a shorter coalescence time, as observed in recent experiments.
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