Rheology of non-Brownian particles suspended in concentrated colloidal dispersions at low particle Reynolds number
Date
2015-12-08
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Publisher
The Society of Rheology
Abstract
The shear flow of non-Brownian glass spheres suspended in a concentrated colloidal dispersion that exhibits non-Newtonian rheology is
investigated. At low volume fractions, the addition of non-Brownian spherical particles to the colloidal dispersion leads to an increase in the
steady shear viscosity as well as the dynamic moduli. The flow curves of these suspensions are qualitatively similar to the suspending
colloidal dispersion medium, and as such, in this semidilute regime, the suspension data can be shifted on to that of the colloidal dispersion
medium at constant shear stress with shift factors comparable to those predicted for spherical particles in a Newtonian fluid. At higher
volume fractions of non-Brownian spheres, the shear thickening power law exponent increases with the addition of non-Brownian particles.
This increase in the shear thickening power law exponent is shown to be consistent with the effects of confinement on the shear thickening
colloidal dispersion by the larger non-Brownian particles.
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Citation
Cwalina, Colin D., and Norman J. Wagner. "Rheology of non-Brownian particles suspended in concentrated colloidal dispersions at low particle Reynolds number." Journal of Rheology (1978-present) 60.1 (2016): 47-59.