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Effect of confinement in wall-bounded non-colloidal suspensions

Published online by Cambridge University Press:  21 June 2016

Stany Gallier ,
Elisabeth Lemaire ,
Laurent Lobry  and
Francois Peters
Stany Gallier*
Affiliation:
SAFRAN-Herakles, Le Bouchet Research Center, 91710 Vert le Petit, France
Elisabeth Lemaire
Affiliation:
University of Nice, CNRS, LPMC-UMR 7336, Parc Valrose, 06100 Nice, France
Laurent Lobry
Affiliation:
University of Nice, CNRS, LPMC-UMR 7336, Parc Valrose, 06100 Nice, France
Francois Peters
Affiliation:
University of Nice, CNRS, LPMC-UMR 7336, Parc Valrose, 06100 Nice, France
*
†Email address for correspondence: stany.gallier@herakles.com
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Abstract

This paper presents three-dimensional numerical simulations of non-colloidal dense suspensions in a wall-bounded shear flow at zero Reynolds number. Simulations rely on a fictitious domain method with a detailed modelling of particle–particle and wall–particle lubrication forces, as well as contact forces including particle roughness and friction. This study emphasizes the effect of walls on the structure, velocity and rheology of a moderately confined suspension (channel gap to particle radius ratio of 20) for a volume fraction range $0.1\leqslant {\it\phi}\leqslant 0.5$. The wall region shows particle layers with a hexagonal structure. The size of this layered zone depends on volume fraction and is only weakly affected by friction. This structure implies a wall slip which is in good accordance with empirical models. Simulations show that this wall slip can be mitigated by reducing particle roughness. For ${\it\phi}\lessapprox 0.4$, wall-induced layering has a moderate impact on the viscosity and second normal stress difference $N_{2}$. Conversely, it significantly alters the first normal stress difference $N_{1}$ and can result in positive $N_{1}$, in better agreement with some experiments. Friction enhances this effect, which is shown to be due to a substantial decrease in the contact normal stress $|{\it\Sigma}_{xx}^{c}|$ (where $x$ is the velocity direction) because of particle layering in the wall region.

JFM classification

Complex Fluids: Complex Fluids Non-Newtonian Flows: Rheology Complex Fluids: Suspensions
Type
Papers
Information
Journal of Fluid Mechanics , Volume 799 , 25 July 2016 , pp. 100 - 127
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Copyright
© 2016 Cambridge University Press 

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