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DY: Fachverband Dynamik und Statistische Physik
DY 22: Granular Matter/ Contact Dynamics
DY 22.4: Talk
Wednesday, March 16, 2011, 14:45–15:00, HÜL 186
Amplitude-dependent phase-separation in vibrated dry granular matter — •Klaus Röller1, James P.D. Clewett2, Roger M. Bowley2, Stephan Herminghaus1, and Michael R. Swift2 — 1MPI for Dynamics and Self-Organization, Bunsenstr. 10, D-37073 Göttingen, Germany — 2School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
A new phase transition is observed experimentally and by simulation in a dry granular gas subject to vertical vibration between two horizontal plates. Molecular dynamics simulations allow to investigate the observed phase separation in detail. We find a high-density, low temperature gas, coexisting with a low-density, high temperature gas moving coherently. A simple scaling argument approximately gives the amplitude dependence of the temperature in each phase. The characteristic dependence of the phase separation on the vibration amplitude distinguishes this phase separation from other known transitions in driven granular media.