Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session KP1: Poster Session (3:20-4:05pm)
Monday, November 19, 2018
Georgia World Congress Center Room: Level 1, Exhibit Hall B2 by the GFM videos
Abstract ID: BAPS.2018.DFD.KP1.65
Abstract: KP1.00065 : Dynamics of a Laser-induced Bubble Near a Convex Free Surface*
This paper experimentally documents the behavior of a laser-induced bubble near a convex paraboloidal free surface with different vertical radius of curvatures, generated in a rotating cylindrical water flask. Due to the strong influence of the free surface, the bubble forms a microjet outwards the free surface when it collapses. And the nondimensional bubble collapse time, Tc/Tc’, is smaller than 1, where Tc is the bubble collapse time and Tc’ is the Rayleigh time of bubble collapse with an equivalent maximum radius. As the relative distance between the bubble center and the free surface, h/Rmax, decreases, Tc/Tc’ decreases, which is different with the bubble behavior near a flat rigid boundary, where h is the distance between the bubble center and the flat free surface or the convex free surface center, Rmax is bubble equivalent maximum radius. Meanwhile the convex free surface provides a focusing mechanism to the splash on the free surface when bubble collapses. The splash gets a higher velocity when rs/Rmax decreases.
*The work was supported by National Natural Science Foundation of China (No. 51476083), National Basic Research Program of China (No. 613321), and State Key Laboratory of Hydro Science and Engineering (Research Fund Program, No: 2017-KY-03).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.KP1.65
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