Competition of Brazil nut effect, buoyancy, and inelasticity induced segregation in a granular mixture

Abstract

It has been recently reported that a granular mixture in which grains differ in their restitution coefficients presents segregation: the more inelastic particles sink to the bottom. When other segregation mechanisms as buoyancy and the Brazil nut effect are present, the inelasticity induced segregation can compete with them. First, a detailed analysis, based on numerical simulations of two dimensional systems, of the competition between buoyancy and the inelasticity induced segregation is presented, finding that there is a transition line in the parameter space that determines which mechanism is dominant. In the case of neutrally buoyant particles having different sizes the inelasticity induced segregation can compete with the Brazil nut effect (BNE). Reverse Brazil nut effect (RBNE) could be obtained at large inelasticities of the intruder. At intermediate values, BNE and RBNE coexist and large inelastic particles are found both near the bottom and at the top of the system.

13 pages, 11 figures

References in corpus (3)

• Segregation induced by inelasticity in a vibrofluidized granular mixture
• Brazil-nut effect versus reverse Brazil-nut effect in a moderately dense granular fluid
• Segregation in granular binary mixtures: Thermal diffusion

Cited by in corpus (4)

• Robustness of travelling states in generic non-reciprocal mixtures
• Tracer diffusion coefficients in a moderately dense granular suspension. Stability analysis and thermal diffusion segregation
• Diffusion of intruders in a granular gas thermostatted by a bath of elastic hard spheres
• Kinetic theory of polydisperse granular mixtures: influence of the partial temperatures on transport properties. A review