Boundary conditions for soft glassy flows: slippage and surface fluidization
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Updated: Apr 29, 2026

Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
Published on: April 10, 2017
Vincent Mansard1, Lydéric Bocquet, Annie Colin
1Rhodia Laboratoire du Futur, Unité mixte Rhodia-CNRS, Université Bordeaux I, UMR 5258, Bordeaux, France. annie.colin@u-bordeaux.fr.
Abstract:
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.
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