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A new segregation criterion based on the inelastic Enskog kinetic equation isderived to show the transition between the Brazil-nut effect (BNE) and thereverse Brazil-nut effect (RBNE) by varying the different parameters of thesystem. In contrast to previous theoretical attempts the approach is notlimited to the near-elastic case, takes into account the influence of boththermal gradients and gravity and applies for moderate densities. The form ofthe phase-diagrams for the BNE/RBNE transition depends sensitively on the valueof gravity relative to the thermal gradient, so that it is possible to switchbetween both states for given values of the mass and size ratios, thecoefficients of restitution and the solid volume fraction. In particular, theinfluence of collisional dissipation on segregation becomes more important whenthe thermal gradient dominates over gravity than in the opposite limit. Thepresent analysis extends previous results derived in the dilute limit case andis consistent with the findings of some recent experimental results.

Brazil-nut effect versus reverse Brazil-nut effect in a moderately dense granular fluid