Diffusivity and Weak Clustering in a Quasi 2D Granular Gas

Abstract

We present results from a detailed simulation of a quasi-2D dissipative granular gas, kept in a non-condensed steady state via vertical shaking over a rough substrate. This gas shows a weak power-law decay in the tails of its Pair Distribution Functions (PDF's), indicating fractality and therefore a tendency to form clusters over several size scales. This clustering depends monotonically on the dissipation coefficient, and disappears when the sphere-sphere collisions are conservative. Clustering is also sensitive to the packing fraction. This gas also displays the standard nonequilibrium characteristics of similar systems, including non-Maxwellian velocity distributions. The diffusion coefficients are calculated over all the conditions of the simulations, and it is found that diluted gases are more diffusive for smaller restitution coefficients.

14 pages, 11 figures

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• Reducing segregation in vibrated binary-sized granular mixtures by excessive small particle introduction
• Effective potentials in a bidimensional vibrated granular gas
• Granular beads in a vibrating, quasi two-dimensional cell: The true shape of the effective pair potential
• Runout transition and clustering instability observed in binary-mixture avalanche deposits