Relation between ordering and shear thinning in colloidal suspensions
Name
Xu-2013-The relation between ordering and shear thinning in colloidal suspensions.pdf
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603.38 KB
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Author(s)
Xu, Xinliang
Rice, Stuart A.
Dinner, Aaron R.
Date Issued
February 2013
Journal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences (U.S.)
Citation
Xu, X., S. A. Rice, and A. R. Dinner. “Relation between ordering and shear thinning in colloidal suspensions.” Proceedings of the National Academy of Sciences 110, no. 10 (March 5, 2013): 3771-3776.
Version
Final published version
Abstract
Colloidal suspensions exhibit shear thinning and shear thickening. The most common interpretation of these phenomena identifies layering of the fluid perpendicular to the shear gradient as the driver for the observed behavior. However, studies of the particle configurations associated with shear thinning and thickening cast doubt on that conclusion and leave unsettled whether these nonequilibrium phenomena are caused primarily by correlated particle motions or by changes in particle packing structure. We report the results of Stokesian dynamics simulations of suspensions of hard spheres that illuminate the relation among the suspension viscosity, shear rate, and particle configuration. Using a recently introduced sampling technique for nonequilibrium systems, we show that shear thinning can be decoupled from layering, thereby eliminating layering as the driver for shear thinning. In contrast, we find that there is a strong correlation between shear thinning and a two-particle measure of the shear stress. Our results are consistent with a recent experimental study.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1073/pnas.1301055110
