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" 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, growing with density, that characterizes order in the velocity field.
Non-equilibrium length in granular fluids: From experiment to fluctuating hydrodynamics
G. Gradenigo;A. Sarracino;A. Puglisi
2011
Abstract
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" 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, growing with density, that characterizes order in the velocity field.File in questo prodotto:
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