Fluctuation Theorems for an Asymmetric Rotor in a Granular Gas

Joubaud, S. and Lohse, D. and Meer van der, R.M. (2012) Fluctuation Theorems for an Asymmetric Rotor in a Granular Gas. Physical review letters, 108 (21). 210604-1 - 210604-5. ISSN 0031-9007

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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.
Item Type:	Article
Copyright:	© 2012 American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Fluids (POF)
Link to this item:	http://purl.utwente.nl/publications/81792
Official URL:	http://dx.doi.org/10.1103/PhysRevLett.108.210604
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