Abstract
The response of rigid aggregates to different flow fields is investigated theoretically using model clusters with realistic three-dimensional structure composed of identical spherical primary particles. The aim is to relate the main fluid dynamic properties of the system with the geometry and morphology of the aggregates. Our simulations are based on Stokesian dynamics. The dilute limit of a colloidal aggregate system was studied, where aggregates are very far from each other, and hence, mutual inter-aggregate interactions are negligible. The motion of aggregates is characterized in terms of translational mobility and angular velocity, and the ability of simple models, based on either the simplified aggregate geometry or the concept of permeability, to capture the main features of the motion is examined.
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