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Particle segregation in dense flowing size-disperse granular mixtures isdriven by gravity and shear, but predicting the associated segregation forcedue to both effects has remained an unresolved challenge. Here, a model of thecombined gravity- and kinematics-induced segregation force on a single intruderparticle is integrated with a model of the concentration dependence of thegravity-induced segregation force. The result is a general model of the netparticle segregation force in flowing size-bidisperse granular mixtures. Usingdiscrete element method simulations for comparison, the model correctlypredicts the segregation force for a variety of mixture concentrations and flowconditions in both idealized and natural shear flows.

General model for segregation forces in flowing granular mixtures