2002/02/26 by L. Trujillo, Leonardo Trujillo, Hans J. Herrmann +1
Engineering · Materials Science · Physics and Astronomy · #Density ratio #Dispersity #Dissipation #Granular flow and fluidized beds #Granular material #Material Dynamics and Properties #Mechanism (biology) #Particle (ecology) #Particle Dynamics in Fluid Flows #Particle size #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1016/s0378-4371(03)00621-6
21 pages, 5 figures
arxiv created 2002/02/26 · openalex publication_date 2003/07/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a hydrodynamic theoretical model for "Brazil nut" size segregation in granular materials. We give analytical solutions for the rise velocity of a large intruder particle immersed in a medium of monodisperse fluidized small particles. We propose a new mechanism for this particle size-segregation due to buoyant forces caused by density variations which come from differences in the local "granular temperature". The mobility of the particles is modified by the energy dissipation due to inelastic collisions and this leads to a different behavior from what one would expect for an elastic system. Using our model we can explain the size ratio dependence of the upward velocity.