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Colloidal microdynamics : pair-drag simulations of model-concentrated aggregated systems
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Silbert, L. E., Melrose, John R. and Ball, Robin (1997) Colloidal microdynamics : pair-drag simulations of model-concentrated aggregated systems. Physical Review E, Vol.56 (No.6). pp. 7067-7077. doi:10.1103/PhysRevE.56.7067 ISSN 1063-651X.
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Official URL: http://dx.doi.org/10.1103/PhysRevE.56.7067
Abstract
We report results of simulations of a model for concentrated aggregated colloidal dispersions under shear flows. In an effort to study trends in rheology for varying colloidal interactions, we study a reduced hydrodynamic, frame-invariant, pair-drag model in which a long-range, many-body mobility matrix is generated just from resistance pair-drag terms that include lubrication. The model also includes depletion interactions, repulsive surface forces, and Brownian forces. We consider the steady-state rheology of the model which we varied in volume fraction between 30% and 53%. We are able to fit our data to experimental results. The rheology of the model is that of a power-law shear-thinning fluid with relative viscosity scaling with shear rate as ηr∼γ̇-α and an exponent close to universal over a range of particle volume fractions 0.45–0.53. We also obtained a shear-thinning exponent that appears to be just weakly sensitive to the hydrodynamic model. The exponent α varies from 0.75±0.02 for weakly aggregating systems to 0.86±0.03 in the case of strong aggregating systems and the experimental data. As we lower the volume fraction we find a model-dependent transition to shear banding, where the rheology is effectively lost. We also find evidence of transitions between different shear-thinning regimes at the higher volume fractions when the particles are arranged in the familiar strings phases.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Colloids, Shear flow, Rheology, Simulation methods | ||||
Journal or Publication Title: | Physical Review E | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1063-651X | ||||
Official Date: | 1997 | ||||
Dates: |
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Volume: | Vol.56 | ||||
Number: | No.6 | ||||
Page Range: | pp. 7067-7077 | ||||
DOI: | 10.1103/PhysRevE.56.7067 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published |
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