Competition of Brazil nut effect,buoyancy, and inelasticity induced segregation in a granular mixture |
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Authors: | R Brito and R Soto |
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Institution: | 1.Departamento de Física Aplicada I and GISC,Facultad de Ciencias Físicas, Universidad Complutense,Madrid,Spain;2.Departamento de Física, FCFM,Universidad de Chile,Santiago,Chile |
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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. |
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Keywords: | |
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