Experimental study of a granular gas homogeneously driven by particle rotations

E. Falcon, J.-C. Bacri & C. Laroche
Univ Paris Diderot, Sorbonne Cité, MSC, CNRS, UMR 7057, F-75 013 Paris, France, EU

Reference:  AIP Conf. Proc. 1542, pp. 815-818 (2013)

URL: http://aip.scitation.org/doi/abs/10.1063/1.4812056


We report an experimental study of a dilute ``gas'' of magnetic particles subjected to a vertical alternating magnetic field in a 3D container. Due to the torque exerted by the field on the magnetic moment of each particle, a spatially homogeneous and random forcing is reached where only rotational motions are driven. This forcing differs significantly from boundary-driven systems used in most previous experimental studies on non equilibrium dissipative granular gases. Here, no cluster formation occurs, and the equation of state displays strong analogy with the usual gas one apart from a geometric factor. These observations and the measurement of collision statistics at a container wall are well explained by a simple model, and enable to better understand out-of-equilibrium systems uniformly ``heated''.

45.70.-n  Granular systems
             05.20.Dd  Kinetic theory
             75.50.-y  Studies of specific magnetic materials

Keywords: Granular gases ; Experiments ; Homogeneous forcing ; Equation of State

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