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Air evolution during drop impact on liquid pool
Scientific Reports ( IF 4.6 ) Pub Date : 2020-04-01 , DOI: 10.1038/s41598-020-62705-5
Ji San Lee , Byung Mook Weon , Su Ji Park , Ji Tae Kim , Jaeyeon Pyo , Kamel Fezzaa , Jung Ho Je

We elucidate the evolution of the entrained air in drop impact on a wide range of liquids, using ultrafast X-ray phase-contrast imaging. We elaborate the retraction mechanism of the entrapped air film in terms of liquid viscosity. We found the criterion for deciding if the entrapped air evolves into single or double bubbles, as determined by competition among inertia, capillarity, and viscosity. Low viscosity and low surface tension induce a small daughter droplet encapsulated by a larger air shell bubble, forming an antibubble. We demonstrate a phase diagram for air evolution regarding hydrodynamics.



中文翻译:

液滴下落期间的空气逸出对液池

我们使用超快X射线相衬成像技术,阐明了液滴对各种液体的撞击中所夹带的空气的演变。我们从液体粘度的角度阐述了夹带的气膜的收缩机理。我们找到了确定截留的空气演变成单气泡还是双气泡的标准,该标准由惯性,毛细作用和粘度之间的竞争确定。低粘度和低表面张力会导致小的子液滴被较大的气泡包裹,从而形成防气泡。我们展示了关于空气动力学的空气演化的相图。

更新日期:2020-04-01
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