# Viscous resuspension of non-Brownian particles: determination of the concentration profiles and particle normal stresses

## TL;DR

This study investigates viscous resuspension in non-Brownian suspensions by measuring local shear rate, particle concentration, and normal stresses, providing detailed insights into particle behavior under shear in a Couette cell.

## Contribution

It introduces a method for local measurement of particle concentration and normal stresses in non-Brownian suspensions under shear, advancing understanding of suspension rheology.

## Key findings

- Particle volume fraction profiles vary with Shields number.
- Normal stresses in the vorticity direction are quantified.
- Profiles depend on shear conditions and particle properties.

## Abstract

We perform local measurements of both the shear rate and the particle fraction to study viscous resuspension in non-Brownian suspensions. A suspension of PMMA spherical particles dispersed in a lighter Newtonian fluid (Triton X100) is sheared in a vertical Couette cell. The vertical profiles of the particle volume fraction are measured for Shields numbers ranging from 10 --3 to 1, and the variation in the particle normal stress in the vorticity direction of the particle fraction is deduced.