Plug flow and the breakdown of Bagnold scaling in cohesive granular flows

Details Plug flow and the breakdown of Bagnold scaling in cohesive granular flows Plug flow and the breakdown of Bagnold scaling in cohesive granular flows

2005-09-05

arxiv.org/abs/cond-mat/0509122v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 10 figures

Scientific paper

10.1103/PhysRevE.72.061301

Cohesive granular media flowing down an inclined plane are studied by discrete element simulations. Previous work on cohesionless granular media demonstrated that within the steady flow regime where gravitational energy is balanced by dissipation arising from intergrain forces, the velocity profile in the flow direction scales with depth in a manner consistent with the predictions of Bagnold. Here we demonstrate that this Bagnold scaling does not hold for the analogous steady-flows in cohesive granular media. We develop a generalization of the Bagnold constitutive relation to account for our observation and speculate as to the underlying physical mechanisms responsible for the different constitutive laws for cohesive and noncohesive granular media.

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