Bagnold scaling, density plateau, and kinetic theory analysis of dense granular flow

Details Bagnold scaling, density plateau, and kinetic theory analysis of dense granular flow Bagnold scaling, density plateau, and kinetic theory analysis of dense granular flow

2004-07-25

arxiv.org/abs/cond-mat/0407651v3

Phys. Rev. Lett. 94, 128001 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures. Title changed. Fig.1 replaced. To appear in PPL

Scientific paper

10.1103/PhysRevLett.94.128001

We investigate the bulk rheology of dense granular flow down a rough slope, where the density profile has been found to show a plateau except for the boundary layers in simulations [Silbert {\it et al.}, Phys. Rev. E {\bf 64}, 051302 (2001)]. It is demonstrated that both the Bagnold scaling and the framework of kinetic theory are applicable in the bulk, which allows us to extract the constitutive relations from simulation data. The detailed comparison of our data with the kinetic theory shows quantitative agreement for the normal and shear stresses, but there exists slight discrepancy in the energy dissipation, which causes rather large disagreement in the kinetic theory analysis of the flow.

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