Transient size segregation of a bidisperse granular mixture flowing over a periodic chute is studied using the discrete element method (DEM) and continuum simulations. A recently developed particle-force-based size segregation model is used to predict the time-dependent flow properties of binary mixtures starting from rest. A two-way coupled continuum model that solves the momentum balance and convection-diffusion equations by incorporating the mixture segregation model along with the generalized inertial number-based rheological model is developed for predicting the evolution of segregation. The solids fraction dependence on the local mixture composition is found to be crucial for accurate prediction of segregation for larger size ratios. The predicted concentration profiles and other flow properties of the mixture are found to be in good agreement with the DEM data for a variety of compositions. The evolution of the center of mass of the two species with time is also very well captured for different initial configurations and size ratios using the particle-force-based segregation model.

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• Granular flows
• Granular materials
• Rheology