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Air evolution during drop impact on liquid pool.

ABSTRACT: 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.

SUBMITTER: Lee JS

PROVIDER: S-EPMC7113293 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Air evolution during drop impact on liquid pool.

Lee Ji San JS Weon Byung Mook BM Park Su Ji SJ Kim Ji Tae JT Pyo Jaeyeon J Fezzaa Kamel K Je Jung Ho JH

Scientific reports 20200401 1

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 sh ...[more]

PMID: 32238834

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