Squeeze expulsion in grain size segregation

TL;DR

This study investigates the squeeze expulsion mechanism in grain size segregation during shear flow, revealing how small particles facilitate the upward movement of large particles through microstructural analysis.

Contribution

It provides new statistical and microstructural evidence supporting the squeeze expulsion mechanism in grain segregation, linking force networks and particle rotation.

Findings

Large particles exhibit strong force and contact network anisotropy during squeeze.

Small particles filling voids hinder downward movement and aid upward climb.

Higher friction promotes particle rotation and enhances upward migration.

Abstract

Grain segregation occurs under various conditions, such as vibration, shear and mixing. In the gravity-driven shear flow, size segregation is triggered by the percolation of small particles through the opened voids (kinetic sieving), and large particles are accumulated in the upper layer. One hypothesis for the upward migration of large particles is the squeeze expulsion mechanism, which remains yet ambiguous due to limited evidences from either physical or numerical experiments. Here we show statistically how the percolation of small particles facilitates the upward movement of large particles. We found that in large particles, the mechanical anisotropy (strong force network) coincides with the geometric anisotropy (contact network), which indicates squeeze, and the connectivity of large particles is much higher when they are squeezed through small particles. The presence of small particles filling the voids hinders the downward movements and provides dynamic steps for the climbing large particles. Furthermore, increasing the coefficient of friction promotes rotation and empowers more large particles to reach the top layer, implying that the climbing particles tend to rotate relative to their neighbors. Our findings of the microstructure and movement pattern of individual particles add new evidences to the mechanism of squeeze expulsion and provide new perspective for the study of segregation.