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research article

Viscous growth and rebound of a bubble near a rigid surface

Michelin, Sebastien
•
Gallino, Giacomo  
•
Gallaire, Francois  
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December 3, 2018
Journal of Fluid Mechanics

Motivated by the dynamics of microbubbles near catalytic surfaces in bubble-powered microrockets, we consider theoretically the growth of a free spherical bubble near a flat no-slip surface in a Stokes flow. The flow at the bubble surface is characterised by a constant slip length allowing us to tune the hydrodynamic mobility of its surface and tackle in one formulation both clean and contaminated bubbles as well as rigid shells. Starting with a bubble of infinitesimal size, the fluid flow and hydrodynamic forces on the growing bubble are obtained analytically. We demonstrate that, depending on the value of the bubble slip length relative to the initial distance to the wall, the bubble will either monotonically drain the fluid separating it from the wall, which will exponentially thin, or it will bounce off the surface once before eventually draining the thin film. Clean bubbles are shown to be a singular limit which always monotonically get repelled from the surface. The bouncing events for bubbles with finite slip lengths are further analysed in detail in the lubrication limit. In particular, we identify the origin of the reversal of the hydrodynamic force direction as due to the change in the flow pattern in the film between the bubble and the surface and to the associated lubrication pressure. Last, the final drainage dynamics of the film is observed to follow a universal algebraic scaling for all finite slip lengths.

  • Details
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Type
research article
DOI
10.1017/jfm.2018.876
Web of Science ID

WOS:000451801800004

Author(s)
Michelin, Sebastien
Gallino, Giacomo  
Gallaire, Francois  
Lauga, Eric
Date Issued

2018-12-03

Publisher

Cambridge University Press

Published in
Journal of Fluid Mechanics
Volume

860

Start page

172

End page

199

Subjects

Mechanics

•

Physics, Fluids & Plasmas

•

Physics

•

bubble dynamics

•

low-reynolds-number flows

•

lubrication theory

•

slow motion

•

sphere

•

propulsion

•

particles

•

fluid

•

wall

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LFMI  
Available on Infoscience
December 14, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/152963
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