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Continuous shear thickening transitions in model concentrated colloids - the role of interparticle forces
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Melrose, John R. and Ball, Robin. (2004) Continuous shear thickening transitions in model concentrated colloids - the role of interparticle forces. Journal of Rheology, Vol.48 (No.5). pp. 937-960. ISSN 0148-6055
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Official URL: http://dx.doi.org/10.1122/1.1784783
Abstract
The role of interactions between close particles in the shear thickening of concentrated colloids is examined by using a Stokesian dynamics simulation of model systems. The interactions are repulsive thermodynamic forces and lubrication forces. Three different models are contrasted in their thickening behavior: Brownian spheres, polymer coated spheres, and Hookian spheres. Respectively, they show: a "mild" continuous thickening, a "strong" continuous thickening, and a strain thickening with loss of steady state. The relationship of order-disorder transitions and thickening is examined. Depending on the volume fraction and range of repulsive forces, thickening can be observed with or without an order-disorder transition at its onset. The different thickening responses arise from the dependence of the relaxation time of close particle contacts on interparticle gap. A time-scale based criterion for strong thickening is proposed and supported by the simulations. A simple theoretical model based the motion of a pair of particles leads to this criterion, but also predicts the mild thickening of Brownian spheres. It gives a simple fitting of flow curves which includes the details of the interparticle interactions. (C) 2004 The Society of Rheology.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Colloids, Shear flow -- Simulation methods, Rheology |
| Journal or Publication Title: | Journal of Rheology |
| Publisher: | Society of Rheology |
| ISSN: | 0148-6055 |
| Official Date: | September 2004 |
| Volume: | Vol.48 |
| Number: | No.5 |
| Number of Pages: | 24 |
| Page Range: | pp. 937-960 |
| Identification Number: | 10.1122/1.1784783 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/7959 |
Data sourced from Thomson Reuters' Web of Knowledge
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