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Tuning the distance to the equipartition by controlling the collision rate in a driven granular gas experiment

In a granular gas experiment of magnetized particles confined in a thin layer, the rate of dissipative collisions is tuned by adjusting the amplitude of an external magnetic field. The velocity statistics are analyzed using the dynamic and static structure factors of transverse velocity modes. Using the fluctuating hydrodynamics theory we measure the deviation from kinetic energy equipartition in this out-of-equilibrium system as a function of the dissipative collision rate. When the collision rate is decreased, the distance to equipartition becomes smaller meaning that the dynamical properties of this granular gas approach by analogy those of a molecular gas in thermal equilibrium.

preprint2020arXivOpen access
Gustavo CastilloSimon MerminodEric FalconMichael Berhanu
cond-mat.stat-mechcond-mat.soft
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Open access4 authors2 topics
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Gustavo CastilloSimon MerminodEric FalconMichael Berhanu

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