Fluidization of Wet Granulates under Hydrodynamic Shear

Details Fluidization of Wet Granulates under Hydrodynamic Shear Fluidization of Wet Granulates under Hydrodynamic Shear

2011-05-13

arxiv.org/abs/1105.2594v1

Physics

Fluid Dynamics

Scientific paper

We investigate the fluidization threshold of three-dimensional cohesive granulates under hydrodynamic shear forces exerted by a creeping ow. A continuum model of flow through porous media provides an analytical expression for the average drag force on a single grain. The balance equation for the forces and a force propagation model are then used to investigate the effects of porosity and packing structure on the stability of the pile. We obtain a closed-form expression for the fluidization threshold of a regular packing of mono-disperse frictionless cohesive spherical grains in a planar fracture. The compound effect of structural (packing orientation and porosity) and dynamical properties of the system on its stability is quantified.

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