Shear and normal stress measurements in non-Brownian monodisperse and bidisperse suspensions

TL;DR

This paper corrects previous data on normal stress differences in non-Brownian suspensions, aligning experimental results with theoretical calculations and clarifying the signs and magnitudes of these stresses.

Contribution

It provides corrected measurements of normal stress differences in monodisperse and bidisperse suspensions, improving accuracy and consistency with theoretical models.

Findings

Corrected values of $N_1$ and $N_2$ show different signs and magnitudes.

Negative $N_1$ values are larger than previously reported.

Results agree with Stokesian Dynamics simulations.

Abstract

There was an error in data reduction, resulting in incorrect values for the normal stress differences $N_1$ and $N_2$ shown in Figs. 7-10, and the corrected figures are shown here. In particular, the algebraic sign of $N_1$ is changed, as are the relative magnitudes of $N_1$ and $N_2$. The negative values of $N_1$ for these non-shear-thickening suspensions are larger in magnitude than those reported by other workers, but both $N_1$ and $N_2$ are in general agreement with the accelerated Stokesian Dynamics calculations of Sierou and Brady [1].