Regensburg 2010 – scientific programme

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BP: Fachverband Biologische Physik

BP 17: Anomalous Transport I (joint BP, DY)

BP 17.4: Talk

Wednesday, March 24, 2010, 10:15–10:30, H38

Subdiffusive Dynamics in Dense Driven Granular Media — •Matthias Sperl and Elmar Staerk — DLR Cologne

Granular media is characterized by non-elastic collisions among particles and obstacles; collisions lead to dissipation of energy. This lost energy needs to be replenished to achieve a steady state, and such a non-equilibrium steady state is investigated in our experiments. The driving is realized in two dimensions on a vibrating table; the particles dynamics is monitored by high-speed cameras with a specially adapted long-time recording system: Several minutes of dynamics can be recorded with millisecond resolution. The dynamical window allows the identification of several decades of anomalous dynamics and respective exponents in the mean-squared displacement. We investigate two granular systems in their dense regime: (1) a granular Lorentz system, where a single particles explores an environment of quenched disorder, and (2) the glass-like dynamics of a system with many particles. In both cases, the resulting dynamics shows both remnants of their equilibrium counterparts and marked differences. E.g., results vary with differences in the rates of driving and dissipation. A comparison with results from theory and computer simulation will be performed.