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Cavity collapse near slot geometries

Cavity collapse near slot geometries
Cavity collapse near slot geometries
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.
0022-1120
Andrews, Elijah David
81c1497b-1d44-4359-b026-f2ef2259b8c3
Fernandez Rivas, David
9fce6d79-2b22-4c83-b04e-beeebf36e42a
Peters, Ivo R
222d846e-e620-4017-84cb-099b14ff2d75
Andrews, Elijah David
81c1497b-1d44-4359-b026-f2ef2259b8c3
Fernandez Rivas, David
9fce6d79-2b22-4c83-b04e-beeebf36e42a
Peters, Ivo R
222d846e-e620-4017-84cb-099b14ff2d75

Andrews, Elijah David, Fernandez Rivas, David and Peters, Ivo R (2020) Cavity collapse near slot geometries. Journal of Fluid Mechanics, 901, [A29]. (doi:10.1017/jfm.2020.552).

Record type: Article

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.

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Andrews et al JFM 2020 Authors version - Accepted Manuscript
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Accepted/In Press date: 24 June 2020
Published date: 2 September 2020

Identifiers

Local EPrints ID: 442168
URI: http://eprints.soton.ac.uk/id/eprint/442168
ISSN: 0022-1120
PURE UUID: 3dcb67a4-2b82-41a6-a74b-e6276a81ad5d
ORCID for Elijah David Andrews: ORCID iD orcid.org/0000-0002-4634-199X
ORCID for Ivo R Peters: ORCID iD orcid.org/0000-0002-3549-3322

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Date deposited: 08 Jul 2020 16:30
Last modified: 28 Apr 2022 04:35

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Contributors

Author: Elijah David Andrews ORCID iD
Author: David Fernandez Rivas
Author: Ivo R Peters ORCID iD

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