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Proceedings Paper

Numerical simulation of three laser-induced in-phase bubbles
Author(s): Hengzhu Bao; Hongchao Zhang; Lou Gao; Chong Zhang; Jian Lu
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Paper Abstract

The potential applications of laser-induced bubbles are gradually revealed. And the performance of multiple - bubbles also attracted considerable attention. This paper is intended to study the complex interaction among three in-line arranged in-phase bubbles. This work illustrates the interactions of three bubbles oscillation and the shockwave motion after the recombination of the plasma nanosecond laser excited. The Volume of Fluid (VOF) model is used to numerically analyze the behaviour of same equilibrium size, same distance and in-phase multiple-bubbles, which enables tracking of the gas-liquid interface and the field. The numerical results indicate that, in the expanding stage, due to the pressure gradient, bubbles at both ends move towards the centre, while the bubble surfaces facing to other bubbles get flattening. The central bubble has longer oscillation period than the side bubbles. In the shrinking stage, the side bubbles get deformation faster, and then collapse with a jet or get adhere to the central bubble. The initial high-pressure bubble radiates a shockwave at the beginning of the expansion. The shock wave propagates outwards from the point source in a circular pattern, resulting in interference in the overlap of the two shock waves. A curved pressure wave, which is parallel to the in-line array, is produced by the interference of multiple shock waves. The pressure wave decays to an acoustic wave after a certain distance according to its initial intensity. In particular, a significant variable γ=D/(R+R) deserves studying in this progress.

Paper Details

Date Published: 29 March 2019
PDF: 6 pages
Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110461P (29 March 2019); doi: 10.1117/12.2524268
Show Author Affiliations
Hengzhu Bao, Nanjing Univ. of Science and Technology (China)
Hongchao Zhang, Nanjing Univ. of Science and Technology (China)
Lou Gao, Nanjing Univ. of Science and Technology (China)
Chong Zhang, Nanjing Univ. of Science and Technology (China)
Jian Lu, Nanjing Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 11046:
Fifth International Symposium on Laser Interaction with Matter
YiJun Zhao, Editor(s)

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