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Hydrodynamic modes in a confined granular fluid

Ricardo Brito1, Dino Risso2, and Rodrigo Soto3

  • 1Departamento de Física Aplicada I and GISC, Universidad Complutense de Madrid, Spain
  • 2Departamento de Física, Universidad del Bío-Bío, Concepción, Chile
  • 3Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile

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Phys. Rev. E 87, 022209 – Published 26 February, 2013

DOI: https://doi.org/10.1103/PhysRevE.87.022209

Abstract

Confined granular fluids, placed in a shallow box that is vibrated vertically, can achieve homogeneous stationary states due to energy injection mechanisms that take place throughout the system. These states can be stable even at high densities and inelasticities allowing for a detailed analysis of the hydrodynamic modes that govern the dynamics of granular fluids. By analyzing the decay of the time correlation functions it is shown that there is a crossover from a quasielastic regime in which energy evolves as a slow mode to an inelastic regime with energy slaved to the other conserved fields. The two regimes have well differentiated transport properties and in the inelastic regime the dynamics can be described by a reduced hydrodynamics with modified longitudinal viscosity and sound speed. The crossover between the two regimes takes place at a wave vector that is proportional to the inelasticity. A two-dimensional granular model, with collisions that mimic the energy transfers that take place in a confined system, is studied by means of microscopic simulations. The results show excellent agreement with the theoretical framework and allow validation of hydrodynamiclike models.

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Phys. Rev. E 87, 022209– Published 26 February, 2013
  • Received 4 January 2013

©2013 American Physical Society

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