Velocity distribution in a viscous granular gas.

Phys Rev E Stat Nonlin Soft Matter Phys

Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, 92093-0340, USA.

Published: March 2005

We investigate the velocity relaxation of a viscous one-dimensional granular gas in which neither energy nor momentum is conserved in a collision. Of interest is the distribution of velocities in the gas as it cools, and the time dependence of the relaxation behavior. A Boltzmann equation of instantaneous binary collisions leads to a two-peaked distribution, as do numerical simulations of grains on a line. Of particular note is that in the presence of friction there is no inelastic collapse, so there is no need to invoke additional assumptions such as the quasielastic limit.

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http://dx.doi.org/10.1103/PhysRevE.71.032301DOI Listing

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