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Microstructure and rheology of soft to rigid shear-thickening colloidal suspensions.
- Source :
- Journal of Rheology; Nov/Dec2015, Vol. 59 Issue 6, p1377-1395, 19p
- Publication Year :
- 2015
-
Abstract
- The shear rate-dependent rheological properties of soft to rigid colloidal suspensions are studied using computational models. We show that a contact force defined based on an elastohydrodynamic deformation theory captures an important rheological behavior of colloidal suspensions: While near hard-sphere particles exhibit a strong and continuous shear thickening the evolves to a constant viscosity state, soft suspensions undergo a second shear-thinning regime at high Peclet numbers when the hydrodynamic stresses become larger than the modulus of the colloidal particles. We measure N<subscript>1</subscript> and N<subscript>2</subscript> to be large and negative in the shear-thickening regime; however, for soft spheres at the onset of second shear-thinning N2 reduces in magnitude and eventually becomes positive. We show that for near hard-sphere suspensions, colloidal pressure, shear stress, and normal stress difference coefficients tend to diverge near the maximum packing fraction while P > σ > N<subscript>1</subscript> > N<subscript>2</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01486055
- Volume :
- 59
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Rheology
- Publication Type :
- Academic Journal
- Accession number :
- 110799318
- Full Text :
- https://doi.org/10.1122/1.4931655