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Diffusivity and Weak Clustering in a Quasi 2D Granular Gas

Authors
  • Perera-Burgos, J. A.
  • Perez-Angel, G.
  • Nahmad-Molinari, Y.
Type
Preprint
Publication Date
Jun 01, 2010
Submission Date
Jun 01, 2010
Identifiers
DOI: 10.1103/PhysRevE.82.051305
Source
arXiv
License
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External links

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.

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