Diffusion and mixing in gravity-driven dense granular flows.

@article{Choi2004DiffusionAM,
  title={Diffusion and mixing in gravity-driven dense granular flows.},
  author={Jaehyuk Choi and Arshad Kudrolli and R. R. Rosales and Martin Z. Bazant},
  journal={Physical review letters},
  year={2004},
  volume={92 17},
  pages={174301}
}
We study the transport properties of particles draining from a silo using imaging and direct particle tracking. The particle displacements show a universal transition from superdiffusion to normal diffusion, as a function of the distance fallen, independent of the flow speed. In the superdiffusive (but sub-ballistic) regime, which occurs before a particle falls through its diameter, the displacements have fat-tailed and anisotropic distributions. In the diffusive regime, we observe very slow… CONTINUE READING
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