Regensburg 2007 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Granular matter / contact dynamics II
DY 31.4: Talk
Friday, March 30, 2007, 11:00–11:15, H2
Translation and Rotation are correlated in Granular Gases — •Thorsten Poeschel1, Nikolai Brilliantov2, Till Kranz3, and Annette Zippelius3 — 1Charité, Augustenburger Platz 1, 13353 Berlin — 2Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam — 3Institut für Theoretische Physik, Universität Göttingen, Friedrich-Hund-Platz 1, 37073 Göttingen
In a granular gas of rough spherical particles the axis of rotation of the particles is correlated with the translational velocity of the particles. The average relative orientation of angular and linear velocities depends on the coefficients of restitution which characterize the dissipative nature of the collision. We derive a theory for these correlations and validate it with numerical simulations for a wide range of coefficients of normal and tangential restitution. Surprisingly, even for vanishinlgy small roughness, there are macroscopic correlations of the particles. Therefore, granular gases of almost smooth particles behave very different from gases of smooth particles, that is, the limit of smooth spheres does not exist.
Reference: cond-mat/0609213