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Hydrodynamic resistance of aggregates approaching a solid surface

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
107
Issue
2
Identifiers
DOI: 10.1016/0021-9797(85)90200-0

Abstract

Abstract A photographic technique using stroboscopic illumination was used to determine the motion of aggregates towards a plane solid surface. The motion of aggregates consisting of two spherical particles was studied under creeping flow conditions. The resistance coefficient corrections λ for motion near a wall were determined as a function of the distance to the wall and the orientation of the aggregate. The magnitude of the hydrodynamic resistance depends on the orientation of the aggregates and can be lower or higher than the resistance observed for the approach of a single particle composing the doublet. Owing to the asymmetry in aggregate-wall hydrodynamic interactions, there is a tendency for the aggregates to rotate when they approach the collector surface. A simple theoretical model is developed to calculate the resistance coefficient corrections λ as a function of aggregate orientation and gap width. Good agreement exists between the calculated values and those determined experimentally, except when the particle's orientation is nearly parallel to the wall.

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