A self-similar model for shear flows in dense granular materials

Details A self-similar model for shear flows in dense granular materials A self-similar model for shear flows in dense granular materials

1999-01-28

arxiv.org/abs/cond-mat/9901336v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 2 figures, correction of the text

Scientific paper

10.1209/epl/i2000-00415-5

We propose a model to describe the quasistatic shearing of dry granular materials, which notably captures the differences in velocity profiles recently observed in 2 and 3-D Couette flow experiments. In our scheme, the steady-state flow is due to the intermittent motion of particle clusters moving together with the wall. The motion of a cluster is associated with the transient formation of a fracture inside the sheared pack. The model is based on the existence of a persistence length for the fractures, which imposes a self-similar structure on the clusters. Through a probabilistic approach, we can evaluate the rate of appearance of a cluster of a given size and obtain a prediction for the average velocity profiles. We also predict the existence of large stress fluctuations at the moving wall, which characteristics are in good agreement with experimental data.

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