Berlin 2015 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 4: Granular Matter / Contact Dynamics Part I

DY 4.8: Talk

Monday, March 16, 2015, 11:30–11:45, BH-N 128

Maxwell Construction for Nonequilibrium Steady-State Phase Separation in Granular Matter — •James Clewett — Max Planck Institute for Self Organisation, Bunsenstrasse, Goettingen 37077

Experiments and computer simulations are carried out to investigate phase separation in a granular gas under external vibration in a large sample cell. The densities of the dilute and the dense phase are found to follow a lever rule, suggesting an equation of state. We show that this equation of state, which exhibits a non-monotonic pressure-volume characteristic, P(v), can be obtained from simulations of a small cell. A Maxwell construction is found to predict both the coexisting pressure and binodal densities remarkably well, despite the fact that P(v) is not an isotherm. Although the system is far from equilibrium and energy conservation is strongly violated, we can derive this finding from an energy minimization argument of fluctuating currents.