Stress distributions in flowing aggregated colloidal suspensions
Silbert, L. E., Farr, R. S. , Melrose, John R. and Ball, Robin. (1999) Stress distributions in flowing aggregated colloidal suspensions. Journal of Chemical Physics, Vol.111 (No.10). pp. 4780-4789. ISSN 0021-9606Full text not available from this repository.
Official URL: http://dx.doi.org/10.1063/1.479241
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|
|Official Date:||8 September 1999|
|Number of Pages:||10|
|Page Range:||pp. 4780-4789|
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