Non-equilibrium length in granular fluids: From experiment to fluctuating hydrodynamics

  title={Non-equilibrium length in granular fluids: From experiment to fluctuating hydrodynamics},
  author={G. Gradenigo and A. Sarracino and D. Villamaina and A. Puglisi},
  • G. Gradenigo, A. Sarracino, +1 author A. Puglisi
  • Published 2011
  • Physics
  • EPL
  • 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… CONTINUE READING
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