Approach to jamming in an air-fluidized granular bed

Details Approach to jamming in an air-fluidized granular bed Approach to jamming in an air-fluidized granular bed

2006-04-27

arxiv.org/abs/cond-mat/0604632v1

Phys. Rev. E 74, 031308/1-12 (2006)

Physics

Condensed Matter

Soft Condensed Matter

experiment

Scientific paper

10.1103/PhysRevE.74.031308

Quasi-2D bidisperse amorphous systems of steel beads are fluidized by a uniform upflow of air, so that the beads roll on a horizontal plane. The short-time ballistic motion of the beads is stochastic, with non-Gaussian speed distributions and with different average kinetic energies for the two species. The approach to jamming is studied as a function of increasing bead area fraction and also as a function of decreasing air speed. The structure of the system is measured in terms of both the Voronoi tessellation and the pair distribution function. The dynamics of the system is measured in terms of both displacement statistics and the density of vibrational states. These quantities all exhibit tell-tale features as the dynamics become more constrained closer to jamming. Though the system is driven and athermal, the behavior is remarkably reminiscent of that in dense colloidal suspensions and supercooled liquids.

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