Universal and wide shear zones in granular bulk flow

Details Universal and wide shear zones in granular bulk flow Universal and wide shear zones in granular bulk flow

2003-10-17

arxiv.org/abs/cond-mat/0310409v2

Physics

Condensed Matter

Soft Condensed Matter

Minor corrections, accepted for PRL (4 pages, 6 figures)

Scientific paper

10.1103/PhysRevLett.92.094301

We present experiments on slow granular flows in a modified (split-bottomed) Couette geometry in which wide and tunable shear zones are created away from the sidewalls. For increasing layer heights, the zones grow wider (apparently without bound) and evolve towards the inner cylinder according to a simple, particle-independent scaling law. After rescaling, the velocity profiles across the zones fall onto a universal master curve given by an error function. We study the shear zones also inside the material as function of both their local height and the total layer height.

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