Viscous to Inertial Transition in Dense Granular Suspension

Franco Tapia (1) , Mie Ichihara (2) , Olivier Pouliquen (1) , Élisabeth Guazzelli (3)

1 IUSTI - Institut universitaire des systèmes thermiques industriels
2 TUAT-MECH - Dpt of Mechanical Systems Engineering [Tokyo]
3 MSC - Matière et Systèmes Complexes

Granular suspensions present a transition from a Newtonian rheology in the Stokes limit to a Bagnoldian rheology when inertia is increased. A custom rheometer that can be run in a pressure-or a volume-imposed mode is used to examine this transition in the dense regime close to jamming. By varying systematically the interstitial fluid, shear rate, and packing fraction in volume-imposed measurements, we show that the transition takes place at a Stokes number of 10 independent of the packing fraction. Using pressureimposed rheometry, we investigate whether the inertial and viscous regimes can be unified as a function of a single dimensionless number based on stress additivity.

Mots clés: Fluid-particle interactions; Granular flows; Interparticle interactions; Jamming

Domaines: Autre [cond-mat.other]; Sciences de l'ingénieur [physics]

Franco Tapia, Mie Ichihara, Olivier Pouliquen, Élisabeth Guazzelli. Viscous to Inertial Transition in Dense Granular Suspension. Physical Review Letters, 2022, 129, ⟨10.1103/physrevlett.129.078001⟩. ⟨hal-03818789⟩