# The Hatano-Sasa equality: transitions between steady states in a granular gas.

Abstract : An experimental study is presented, about transitions between Non-Equilibrium Steady States (NESS) in a dissipative medium. The core device is a small rotating blade that imposes cycles of increasing and decreasing forcings to a granular gas, shaken independently. The velocity of this blade is measured, subject to the transitions imposed by the periodic torque variation. \\ The Hatano-Sasa equality, that generalises the second principle of thermodynamics to NESS, is verified with a high accuracy (a few $10^{-3}$), at different variation rates. \\ Besides, it is observed that the fluctuating velocity at fixed forcing follows a generalised Gumbel distribution. A rough evaluation of the mean free path in the granular gas suggests that it might be a correlated system, at least partially.
Document type :
Journal articles

Cited literature [7 references]

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00724058
Contributor : Antoine Naert <>
Submitted on : Wednesday, October 10, 2012 - 10:56:25 PM
Last modification on : Thursday, April 19, 2018 - 2:54:03 PM
Long-term archiving on : Friday, January 11, 2013 - 3:42:52 AM

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### Identifiers

• HAL Id : ensl-00724058, version 2
• ARXIV : 1208.4039

### Citation

Anne Mounier, Antoine Naert. The Hatano-Sasa equality: transitions between steady states in a granular gas.. 2012, pp.6. ⟨ensl-00724058v2⟩

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