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Kinematics of vortex ring generated by a drop upon impacting a liquid pool

Author(s): Saha, A; Wei, Y; Tang, X; Law, Chung K

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Abstract: We herein report an experimental study on the morphological evolution of a vortex ring formed inside a liquid pool after it is impacted and penetrated by a coalescing drop of the same liquid. The dynamics of the penetrating vortex ring along with the deformation of the pool surface has been captured using simultaneous high-speed laser induced fluorescence and shadowgraph techniques. It is identified that the motion of such a vortex ring can be divided into three stages, during which inertial, capillary and viscous effects alternatingly play dominant roles to modulate the penetration process, resulting in linear, non-monotonic and decelerating motion in these three stages respectively. Furthermore, we also evaluate the relevant time and length scales of these three stages and subsequently propose a unified description of the downward motion of the penetrating vortex ring. Finally, we use the experimental data for a range of drop diameters and impact speeds to validate the proposed scaling.
Publication Date: 2019
Citation: Saha, A, Wei, Y, Tang, X, Law, CK. (2019). Kinematics of vortex ring generated by a drop upon impacting a liquid pool. Journal of Fluid Mechanics, 875 (842 - 853. doi:10.1017/jfm.2019.503
DOI: doi:10.1017/jfm.2019.503
Pages: 842 - 853
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Fluid Mechanics
Version: Final published version. This is an open access article.

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