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Cavity collapse near slot geometries

Published online by Cambridge University Press:  02 September 2020

Elijah D. Andrews
Affiliation:
Faculty of Engineering and Physical Sciences, University of Southampton, SouthamptonSO17 1BJ, UK
David Fernández Rivas
Affiliation:
Mesoscale Chemical Systems Group, MESA+ Institute, TechMed Centre and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AEEnschede, The Netherlands
Ivo R. Peters
Affiliation:
Faculty of Engineering and Physical Sciences, University of Southampton, SouthamptonSO17 1BJ, UK
Corresponding
E-mail address:

Abstract

The collapse of a gas or vapour bubble near a solid boundary produces a jet directed towards the boundary. High surface pressure and shear stress induced by this jet can damage, or clean, the surface. More complex geometries will result in changes in collapse behaviour, in particular the direction of the jet. The majority of prior research has focused on simple flat boundaries or cases with limited complexity. There is currently very little known about how complex geometries affect bubble collapse. We numerically and experimentally investigate how a slot in a flat boundary affects the jet direction for a single bubble. We use a boundary element model to predict how the jet direction depends on key geometric parameters and show that the results collapse to a single curve when the parameters are normalised appropriately. We then experimentally validate the predictions using laser-induced cavitation and compare the experimental results to the predicted dependencies. This research reveals a tendency for the jet to be directed away from a slot and shows that the jet direction is independent of slot height for slots of sufficient height.

Type
JFM Papers
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Andrews et al. supplementary movie 1

The collapse of a bubble near a slot with with width $W = 2.2$ mm and $H = 2.7$ mm with the bubble positioned at a vertical distance $Y = 2.29$ mm and horizontal distance $X = -2.03$ mm. The jet angle is measured to be $\theta = -0.099$ radians ($-5.7$ degrees). The movie was recorded at 100 000 frames per second and is played back at 24 frames per second. The frames used in figure 2 of the paper are from this movie.

Download Andrews et al. supplementary movie 1(Video)
Video 1 MB

Andrews et al. supplementary movie 2

The jet direction of four bubble collapses in different horizontal positions showing how the jet angle varies with horizontal position.

Download Andrews et al. supplementary movie 2(Video)
Video 8 MB
Supplementary material: PDF

Andrews et al. supplementary material

Supplementary figures

Download Andrews et al. supplementary material(PDF)
PDF 381 KB

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