Hydrodynamic modeling of granular flows in a modified Couette cell

Details Hydrodynamic modeling of granular flows in a modified Couette cell Hydrodynamic modeling of granular flows in a modified Couette cell

2007-12-19

arxiv.org/abs/0712.3195v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages

Scientific paper

10.1103/PhysRevE.77.032301

We present simulations of granular flows in a modified Couette cell, using a continuum model recently proposed for dense granular flows. Based on a friction coefficient, which depends on an inertial number, the model captures the positions of the wide shear bands. We show that a smooth transition in velocity-profile shape occurs when increasing the height of the granular material, leading to a differential rotation of the central part close to the surface. The numerical predictions are in qualitative agreement with previous experimental results. The model provides predictions for the increase of the shear bands width when increasing the rotation rate.

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