Velocity distribution in granular gases of viscoelastic particles

被引:51
作者
Brilliantov, NV
Pöschel, T
机构
[1] Humboldt Univ, Inst Phys, D-10115 Berlin, Germany
[2] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119899, Russia
关键词
D O I
10.1103/PhysRevE.61.5573
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The velocity distribution in a homogeneously cooling granular gas has been studied in the viscoelastic regime, when the restitution coefficient of colliding particles depends on the impact velocity. We show that for viscoelastic particles a simple scaling hypothesis is violated, i.e., that the time dependence of the velocity distribution does not scale with the mean square velocity as in the case of particles interacting via a constant restitution coefficient. The deviation from the Maxwellian distribution does not depend on time monotonically. For the case of small dissipation we detected two regimes of evolution of the velocity distribution function: Starting from the initial Maxwellian distribution, the deviation first increases with time on a collision time scale saturating at some maximal value; then it decays to zero on a much larger time scale which corresponds to the temperature relaxation. For larger values of the dissipation parameter there appears an additional intermediate relaxation regime. Analytical calculations for small dissipation agree well with the results of a numerical analysis.
引用
收藏
页码:5573 / 5587
页数:15
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