Shear thinning of colloidal dispersions
作者:
R. A. Lionberger,
期刊:
Journal of Rheology
(AIP Available online 1998)
卷期:
Volume 42,
issue 4
页码: 843-863
ISSN:0148-6055
年代: 1998
DOI:10.1122/1.550904
出版商: The Society of Rheology
关键词: Colloidal suspension;Dispersion;Suspension
数据来源: AIP
摘要:
In this paper we calculate numerically the shear induced distortion of the equilibrium microstructure in a dilute colloidal suspension. In the low density limit, our predictions both with and without hydrodynamic interactions follow the form of the Ree–Eyring equation for the shear rate dependence of the rheology. For low to intermediate shear rates, rescaling the low density solutions by appropriate volume fraction dependent scale factors captures many of the qualitative features observed in simulation and experiment on systems at high concentration, including shear thinning and normal stresses. At high shear rates, more detailed consideration of many-particle interactions are required to account for the observed phenomenology and the use of the mean-field approximation inherent in the rescalings fails. Comparison of systems with and without hydrodynamic interactions suggests that both hydrodynamic and thermodynamic forces act to increase the stress relaxation time in concentrated suspensions.
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