GRANULAR GAS COOLING AND RELAXATION TO THE STEADY STATE IN REGARD TO THE OVERPOPULATED TAIL OF THE VELOCITY DISTRIBUTION

Thorsten Pöschel (), Nikolai V. Brilliantov () and Arno Formella ()
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Thorsten Pöschel: Charité, Augustenburger Platz, 10439 Berlin, Germany
Nikolai V. Brilliantov: Institute of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
Arno Formella: Universidad de Vigo, Department of Computer Science, Edificio Politécnico, 32004 Ourense, Spain

International Journal of Modern Physics C (IJMPC), 2007, vol. 18, issue 04, 701-711

Abstract: We present a universal description of the velocity distribution function of granular gases,f(v), valid for both, small and intermediate velocities wherevis close to the thermal velocity and also for largevwhere the distribution function reveals an exponentially decaying tail. By means of large-scale Monte Carlo simulations and by kinetic theory we show that the deviation from the Maxwell distribution in the high-energy tail leads to small but detectable variation of the cooling coefficient and to extraordinary large relaxation time.

Keywords: Granular gases; velocity distribution function; overpopulated high-energy tail; 47.70.-n; 51.10.+y (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0129183107010966

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