The statistics of particle velocities in dense granular flows

Details The statistics of particle velocities in dense granular flows The statistics of particle velocities in dense granular flows

2004-12-18

arxiv.org/abs/cond-mat/0412506v1

Physics

Condensed Matter

Soft Condensed Matter

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.068003

We present measurements of the particle velocity distribution in the flow of granular material through vertical channels. Our study is confined to dense, slow flows where the material shears like a fluid only in thin layers adjacent to the walls, while a large core moves without continuous deformation, like a solid. We find the velocity distribution to be non-Gaussian, anisotropic, and to follow a power law at large velocities. Remarkably, the distribution is identical in the fluid-like and solid-like regions. The velocity variance is maximum at the core, defying predictions of hydrodynamic theories. We show evidence of spatially correlated motion, and propose a mechanism for the generation of fluctuational motion in the absence of shear.

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