Binary-size granules segregation from core pattern to streak pattern in a rotating drum

Abstract

There is a paucity of studies on the relationship between the control parameters and kinetic parameters in binary-size granular segregation models. In this study, the machine vision method and particle image velocimetry (PIV) were used to measure the shape index of segregation pattern and streamwise velocity, respectively. Two scaled parameters, control parameters and kinetic parameters, were calculated based on the continuous flow model and segregation model. The control parameters include volume flow rate, and the kinetic parameters include the ratio of segregation effects to diffusion effects. By analyzing the relationship between the two parameters under the core and streak patterns, the configuration of segregation pattern at steady-state changes with the control parameters wherein the ratio of segregation effects to diffusion effects decreases approximately linearly as the volume flow rate decreases. These experimental results aid in revealing the mechanism of segregation and providing the reference data for improving the theoretical models.