Transient segregation of bi-disperse granular mixtures in a periodic chute flow

TL;DR

This study investigates the transient size segregation in bi-disperse granular flows over a periodic chute using DEM and continuum models, demonstrating good agreement with experimental data and capturing the evolution of segregation over time.

Contribution

It introduces a coupled continuum model incorporating a particle force-based segregation approach to predict transient segregation dynamics in granular flows.

Findings

The continuum model accurately predicts concentration profiles.

DEM data confirms the model's effectiveness across compositions.

The model captures the evolution of the center of mass for different configurations.

Abstract

Transient size segregation of a bi-disperse granular mixture flowing over a periodic chute is studied using the Discrete Element Method 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 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 centre 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.