Growing non-equilibrium length in granular fluids: from experiment to fluctuating hydrodynamics

Abstract

Velocity correlations in a 2D granular fluid are studied in experiments and numerical simulations. The transverse component of the velocity structure factor reveals two well defined energy scales, associated with the external "bath temperature" $T_b$ and with the internal granular one, $T_g<T_b$, 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 $\xi$, growing with density, that characterizes order in the velocity field.

5 pages, 4 figures

References in corpus (6)

• Caging dynamics in a granular fluid
• Glass Transition for Driven Granular Fluids
• Irreversible dynamics of a massive intruder in dense granular fluids
• Universal velocity distributions in an experimental granular fluid
• Fluctuating hydrodynamics and correlation lengths in a driven granular fluid
• Hydrodynamic Correlation Functions of a Driven Granular Fluid in Steady State

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