| Issue |
EPL
Volume 96, Number 1, October 2011
|
|
|---|---|---|
| Article Number | 14004 | |
| Number of page(s) | 5 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/96/14004 | |
| Published online | 20 September 2011 | |
Non-equilibrium length in granular fluids: From experiment to fluctuating hydrodynamics
CNR-ISC and Dipartimento di Fisica, Università Sapienza - p.le A. Moro 2, 00185, Roma, Italy, EU
a
alessandro.sarracino@roma1.infn.it
Received:
23
May
2011
Accepted:
18
August
2011
Velocity correlations in a quasi-2D driven granular fluid are studied in experiments and numerical simulations. The transverse velocity structure factor reveals two well-defined energy scales, associated with the external “bath temperature” Tb and with the internal granular one, Tg<Tb, relevant at large and small wavelengths, respectively. Experimental and numerical data are discussed within a fluctuating hydrodynamics model, which allows one to define and measure a non-equilibrium coherence length, growing with density, that characterizes order in the velocity field.
PACS: 45.70.-n – Granular systems / 05.20.Dd – Kinetic theory / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EPLA, 2011
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