Regensburg 2000 – scientific programme

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DY: Dynamik und Statistische Physik

DY 24: Granulare Materie II

DY 24.4: Talk

Tuesday, March 28, 2000, 15:15–15:30, H2

Self-diffusion in granular gases — •Nikolai Brilliantov¹ and Thorsten Pöschel² — ¹Moscow State University, Physics Department, Moscow 119899, Russia — ²ICA1, Universität Stuttgart, Pfaffenwaldring 27, 70569 Stuttgart

The coefficient of self-diffusion for a homogeneously cooling granular gas changes significantly if the impact-velocity dependence of the restitution coefficient є is taken into account. For the case of a constant є the particles spread logarithmically slow with time, whereas the velocity dependent coefficient yields a power law time-dependence. The impact of the difference in these time dependences on the properties of a freely cooling granular gas is discussed.