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Fluctuation theorems for an asymmetric rotor in a granular gas

Abstract : We investigate the validity of fluctuation theorems for an asymmetric rotor experiment in a granular gas. A first state, with a Gaussian distribution of the angular velocity, is found to be well described by a first order Langevin equation. We show that fluctuation theorems are valid for the injected work and for the total entropy production. In a second state the angular velocity distribution is double-peaked due to a spontaneous symmetry breaking: A convection roll develops in the granular gas, which strongly couples to the rotor. Surprisingly, in this case similar symmetry relations hold, which lead to a good prediction for the height ratio of the two peaks.
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Submitted on : Thursday, April 26, 2012 - 9:34:07 PM
Last modification on : Thursday, November 21, 2019 - 2:39:21 AM
Long-term archiving on: : Friday, July 27, 2012 - 2:40:12 AM

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Sylvain Joubaud, Detlef Lohse, Devaraj van der Meer. Fluctuation theorems for an asymmetric rotor in a granular gas. Physical Review Letters, American Physical Society, 2012, 108, pp.210604. ⟨10.1103/PhysRevLett.108.210604⟩. ⟨ensl-00691711⟩

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