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The Simulation of Aggregated Colloids Under Flow

Published online by Cambridge University Press:  15 February 2011

John R. Melrose
John R. Melrose*
Affiliation:
Polymer and Colloid group, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE, U. K
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Abstract

An overview is given of theories of aggregates under flow. These generally assume some sort of structural breakdown as the shear rate is increased. Models vary with both the rigidity of the bonding and the level of treatment of hydrodynamics. Results are presented for simulations of a Rouse model of non-rigid, (i.e. central force) weakly bonded aggregates. In large scale simulations different structures are observed at low and high shear rates. The change from one structure to another is associated with a change in the rate of shear thinning. The model captures low shear rate features of real systems absent in previous models: this feature is ascribed to agglomerate deformations. Quantitatively, the model is two orders of magnitude out from experiment but some scaling is possible.

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