Abstract
The behavior in shear flow of chains of equal-sized interacting spheres depends on their shape and whether or not the spheres touch. Straight nontouching linear aggregates will change length periodically with their orientation, curved ones will bend. When the spheres touch, however, the chains will rotate as rigid bodies. A theory of the behavior of straight chains of nontouching spheres is developed and applied with reasonable success to experiments with chains of polystyrene latex spheres. A theory for the bending of nontouching chains is not yet available, but observations show that the variation in bending angle of a flexible triplet is, under the experimental conditions used, about 25°. A large difference is observed in the behavior in shear flow of nontouching doublets and triplets, thus indicating that caution must be exercised in applying a two-sphere model in calculations of orthokinetic flocculation and coagulation of sols.
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