Tunable fall velocity of a dense ball in oscillatory cross-sheared concentrated suspensions

Frédéric Blanc (1) , Elisabeth Lemaire (1) , François Peters (1)

1 LPMC - Laboratoire de physique de la matière condensée

The fall velocity of a dense large ball in a suspension of neutrally buoyant non-Brownian particles subjected to horizontal oscillatory shear is studied. As the strain amplitude is increased, the velocity increases up to a maximum value before decreasing to the value that it would have in a resting suspension. The higher the frequency is, the stronger the effect is. The falling ball velocity can be largely increased in the presence of the oscillatory cross-shear flow. For instance, for a particle volume fraction of

Mots clés: particle/fluid flows; rheology; suspensions

Domaines: Dynamique des Fluides [physics.flu-dyn]; Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Frédéric Blanc, Elisabeth Lemaire, François Peters. Tunable fall velocity of a dense ball in oscillatory cross-sheared concentrated suspensions. Journal of Fluid Mechanics, 2014, 746, pp.R4. ⟨hal-01026306⟩