TY - JOUR
T1 - Bubble collapse near porous plates
AU - Andrews, Elijah D.
AU - Rivas, David Fernández
AU - Peters, Ivo R.
N1 - Funding Information:
We acknowledge financial support from the EPSRC under grant no. EP/P012981/1. D.F.R. acknowledges the funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement number 851630). Data and code supporting this study are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D2582 .
Publisher Copyright:
© The Author(s), 2023. Published by Cambridge University Press.
PY - 2023/5/10
Y1 - 2023/5/10
N2 - The collapse of a gas or vapour bubble near a non-porous boundary is directed at the boundary due to the asymmetry induced by the nearby boundary. High surface pressure and shear stress from this collapse can damage, or clean, the surface. A porous boundary, such as a filter, would act similarly to a non-porous boundary but with reduced asymmetry and thus reduced effect. Prior research has measured the cleaning effect of bubbles on filters using ultrasonic cleaning, but it is not known how the bubble dynamics are fundamentally affected by the porosity of the surface. We address this question experimentally by investigating how the standoff distance, porosity, pore size and pore shape affect two collapse properties: bubble displacement and bubble rebound size. We show that these properties depend primarily on the standoff distance and porosity of the boundary and extend a previously developed numerical model that approximates this behaviour. Using the numerical model in combination with experimental data, we show that bubble displacement and bubble rebound size each collapse onto respective single curves.
AB - The collapse of a gas or vapour bubble near a non-porous boundary is directed at the boundary due to the asymmetry induced by the nearby boundary. High surface pressure and shear stress from this collapse can damage, or clean, the surface. A porous boundary, such as a filter, would act similarly to a non-porous boundary but with reduced asymmetry and thus reduced effect. Prior research has measured the cleaning effect of bubbles on filters using ultrasonic cleaning, but it is not known how the bubble dynamics are fundamentally affected by the porosity of the surface. We address this question experimentally by investigating how the standoff distance, porosity, pore size and pore shape affect two collapse properties: bubble displacement and bubble rebound size. We show that these properties depend primarily on the standoff distance and porosity of the boundary and extend a previously developed numerical model that approximates this behaviour. Using the numerical model in combination with experimental data, we show that bubble displacement and bubble rebound size each collapse onto respective single curves.
U2 - 10.1017/jfm.2023.266
DO - 10.1017/jfm.2023.266
M3 - Article
SN - 0022-1120
VL - 962
JO - Journal of fluid mechanics
JF - Journal of fluid mechanics
M1 - A11
ER -