Continuous shear thickening transitions in model concentrated colloids - the role of interparticle forces
Melrose, John R. and Ball, R. C.. (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 0148-6055Full text not available from this repository.
Official URL: http://dx.doi.org/10.1122/1.1784783
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|
|Number of Pages:||24|
|Page Range:||pp. 937-960|
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