Boundary conditions for soft glassy flows: slippage and surface fluidization

We explore the question of surface boundary conditions for the flow of a dense emulsion. We make use of microlithographic tools to create surfaces with well controlled roughness patterns and measure using dynamic confocal microscopy both the slip velocity and the shear rate close to the wall, which...

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Bibliographic Details
Published in:Soft matter 2014-09, Vol.1 (36), p.6984-6989
Main Authors: Mansard, Vincent, Bocquet, Lydéric, Colin, Annie
Format: Article
Language:English
Subjects:
Boundary conditions
Chemical Sciences
Confocal
Construction
Engineering Sciences
Fluidizing
Physics
Roughness
Slippage
Surface roughness
Walls
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Summary:We explore the question of surface boundary conditions for the flow of a dense emulsion. We make use of microlithographic tools to create surfaces with well controlled roughness patterns and measure using dynamic confocal microscopy both the slip velocity and the shear rate close to the wall, which we relate to the notion of surface fluidization. Both slippage and wall fluidization depend non-monotonously on the roughness. We interpret this behavior within a simple model in terms of the building of a stratified layer and the activation of plastic events by the surface roughness. We explore the question of surface boundary conditions for the flow of a dense emulsion.
ISSN:1744-683X
1744-6848
DOI:10.1039/c4sm00230j