Segregation induced by inelasticity in a vibrofluidized granular mixture

Abstract

We investigate the segregation of a dense binary mixture of granular particles that only differ in their restitution coefficient. The mixture is vertically vibrated in the presence of gravity. We find a partial segregation of the species, where most dissipative particles submerge in the less dissipative ones. The segregation occurs even if one type of the particles is elastic. In order to have a complete description of the system, we study the structure of the fluid at microscopic scale (few particle diameters). The density and temperature pair distribution functions show strong enhancements respect the equilibrium ones at the same density. In particular, there is an increase in the probability that the more inelastic particles group together in pairs (microsegregation). Microscopically the segregation is buoyancy driven, by the appearance of a dense and cold region around the more inelastic particles.

7 pages, 9 figures, accepted in Phys. Rev E

References in corpus (13)

• Spontaneous Stratification in Granular Mixtures
• Size separation in vibrated granular matter
• Breakdown of Energy Equipartition in a 2D Binary Vibrated Granular Gas
• Mechanisms in the size segregation of a binary granular mixture
• Towards granular hydrodynamics in two-dimensions
• Randomly Driven Granular Fluids: collisional statistics and short scale structure
• Close-packed floating clusters: granular hydrodynamics beyond the freezing point?
• Granular segregation as a critical phenomenon
• A model for the atomic-scale structure of a dense, nonequilibrium fluid: the homogeneous cooling state of granular fluids
• Segregation in granular binary mixtures: Thermal diffusion
• Hydrodynamic profiles for an impurity in a open vibrated granular gas
• Temperature inversion in granular fluids under gravity
• Segregation by friction

Cited by in corpus (10)

• Competition of Brazil nut effect, buoyancy, and inelasticity induced segregation in a granular mixture
• Thermal diffusion segregation in granular binary mixtures described by the Enskog equation
• Roles of energy dissipation in a liquid-solid transition of out-of-equilibrium systems
• Energy nonequipartition in a collisional model of a confined quasi-two-dimensional granular mixture
• Diffusion transport coefficients for granular binary mixtures at low density. Thermal diffusion segregation
• Navier--Stokes transport coefficients for a model of a confined quasi-two-dimensional granular binary mixture
• Segregation by thermal diffusion in granular shear flows
• Tracer diffusion coefficients in a moderately dense granular suspension. Stability analysis and thermal diffusion segregation
• Diffusion of impurities in a moderately dense confined granular gas
• Kinetic theory of polydisperse granular mixtures: influence of the partial temperatures on transport properties. A review