Silbert, L. E., Farr, R. S. , Melrose, John R. and Ball, R. C.. (1999) Stress distributions in flowing aggregated colloidal suspensions. Journal of Chemical Physics, Vol.111 (No.10). pp. 4780-4789. ISSN 0021-9606

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Abstract

Simulations of the flow of concentrated aggregated colloidal systems, at the particulate level, are used to investigate the distribution of stresses in the shear-thinning regime. It is found that the distribution of shear stress carried by interparticle bonds decays approximately exponentially at large stresses, but with a double-exponential distribution for values of positive stress. The microstructural mechanisms associated with large stresses are manifested in clusters which dominate the positive contribution to the stress in the system. Towards the end of shear thinning the highest forces occur along bonds defining rods of particles aligned approximately along the flow-compression direction. We propose that the rheology of such systems is determined by a rupture-reformation process of these clusters of stress concentration during the flow. The aggregation forces play the role of enhancing such stress concentration by stabilizing clusters against buckling. (C) 1999 American Institute of Physics. [S0021-9606(99)51934-X].

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Strains and stresses, Colloids, Rheology
Journal or Publication Title:	Journal of Chemical Physics
Publisher:	American Institute of Physics
ISSN:	0021-9606
Date:	8 September 1999
Volume:	Vol.111
Number:	No.10
Number of Pages:	10
Page Range:	pp. 4780-4789
Identification Number:	10.1063/1.479241
Status:	Peer Reviewed
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/14252

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