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# 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 :
Preprints, Working Papers, ...

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00724058
Contributor : Antoine Naert Connect in order to contact the contributor
Submitted on : Thursday, August 16, 2012 - 10:20:15 PM
Last modification on : Thursday, April 19, 2018 - 2:54:03 PM
Long-term archiving on: : Saturday, November 17, 2012 - 2:25:24 AM

### Files

article17.pdf
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### Identifiers

• HAL Id : ensl-00724058, version 1
• ARXIV : 1208.4039

### Citation

Anne Mounier, Antoine Naert. The Hatano-Sasa equality: transitions between steady states in a granular gas.. 2012. ⟨ensl-00724058v1⟩

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