Transient segregation of bidisperse granular mixtures in a periodic chute flow

Can we predict how mixed grains unmix themselves? A continuum model couples particle-level segregation forces with mixture rheology to capture the inherently linked evolution of flow and segregation in bi-disperse granular systems. It reveals the crucial role of composition-dependent packing arising from size disparity in accurately predicting segregation dynamics. The model successfully reproduces segregation evolution across diverse configurations, compositions, and size ratios, closely matching Discrete Element Method simulations.