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Energy focusing in shock-collapsed bubble arrays

Published online by Cambridge University Press:  17 August 2020

N. Bempedelis Open the ORCID record for N. Bempedelis [Opens in a new window]  and
Y. Ventikos Open the ORCID record for Y. Ventikos [Opens in a new window]
N. Bempedelis
Affiliation:
Department of Mechanical Engineering, University College London, LondonWC1E 7JE, UK
Y. Ventikos*
Affiliation:
Department of Mechanical Engineering, University College London, LondonWC1E 7JE, UK
*
†Email address for correspondence: [email protected]
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Abstract

During its collapse a bubble can draw and concentrate energy from its surroundings. In the present work, we investigate the behaviour of certain multibubble configurations that have the potential for achieving significant levels of energy focusing. The dynamics of these configurations are studied for the first time in three dimensions, and are shown to be significantly different from those in two dimensions. Novel observations regarding focusing regimes in collapsing arrays are presented. Finally, through a series of numerical experiments on previously unexplored arrangements, we demonstrate that substantially enhanced levels of energy concentration can be achieved.

JFM classification

Drops and Bubbles: Bubble dynamics Multiphase and Particle-laden Flows: Gas/liquid flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 900 , 10 October 2020 , A44
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Bempedelis and Ventikos supplementary movie 1

Volume rendering of the density gradient magnitude, p=1GPa shock-induced collapse of a triangular array of three spherical air bubbles in water.

Download Bempedelis and Ventikos supplementary movie 1(Video)
Video 23.8 MB

Bempedelis and Ventikos supplementary movie 2

Volume rendering of the density gradient magnitude, p=1GPa shock-induced collapse of a pyramidal array of five spherical air bubbles in water.

Download Bempedelis and Ventikos supplementary movie 2(Video)
Video 34.1 MB

Bempedelis and Ventikos supplementary movie 3

Volume rendering of the density gradient magnitude, p=1GPa shock-induced collapse of a pair of toroidal and spherical air bubbles in water.

Download Bempedelis and Ventikos supplementary movie 3(Video)
Video 39.5 MB