Abstract
Pseudoplastic flows of neutrally buoyant suspensions of spherical polystyrene particles about 45 μm in diameter have been studied. Affinities between the particles and the medium were changed by varying the water content of the medium mixture of water, ethylene glycol, and propylene glycol. The relation between the shear stress, τ, and the shear rate, D, was expressed by τ = AD 1 2 + CD . The ratio of the effective solid-volume fraction obtained from C to the true one was about 1.2 and was almost constant for all suspensions, suggesting only a small change in the state of dispersion in suspensions. The constant A increased with the decrease in the work of immersion; that is, the pseudoplastic behavior became more notable when the attractive interaction among floccules or particles was stronger.
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