X-ray radiography of viscous resuspension

Brice Saint-Michel (1, 2) , Sébastien Manneville (2) , Steven Meeker (3) , Guillaume Ovarlez (3) , Hugues Bodiguel (4)

1 Department of Chemical Engineering, Imperial College of Science, Technology & Medicine,
2 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
3 LOF - Laboratoire du Futur
4 LRP - Laboratoire Rhéologie et Procédés

We use X-ray imaging to study viscous resuspension. In a Taylor-Couette geometry, we shear an initially settled layer of spherical glass particles immersed in a Newtonian fluid and measure the local volume fraction profiles. In this configuration, the steady-state profiles are simply related to the normal viscosity defined in the framework of the suspension balance model. These experiments allow us to examine this fundamental quantity over a wide range of volume fractions, in particular, in the semidilute regime where experimental data are sorely lacking. Our measurements strongly suggest that the particle stress is quadratic with respect to the volume fraction in the dilute limit. Strikingly, they also reveal a nonlinear dependence on the Shields number, in contrast with previous theoretical and experimental results. This likely points to shear-thinning particle stresses and to a non-Coulomb or velocity-weakening friction between the particles, as also evidenced from shear reversal experiments. I. INTRODUCTION

Domaines: Matière Molle [cond-mat.soft]

Brice Saint-Michel, Sébastien Manneville, Steven Meeker, Guillaume Ovarlez, Hugues Bodiguel. X-ray radiography of viscous resuspension. Physics of Fluids, 2019, 31 (10), pp.103301. ⟨10.1063/1.5103271⟩. ⟨hal-02401025⟩