The Influence of Concentration and Particle Shape on the Rheology of Silica, Flyash and Other Industrial Slurries
Rheograms of aqueous suspensions of pure silica and commercial flyash of comparable particle size distribution but different particle shape, have been compared at different concentrations using a modified viscometer designed to prevent settling of the particles. Using the entropy approach to slurry viscosity, it was possible to show a relationship between the plastic viscosity (η) of the slurry and the vacancy fraction, where the latter is the fluid space available to the suspended particles. This relationship contains a factor which distinguishes between the rounded shape of the flyash particles and the irregular shape of the silica. Extrapolation of this relationship to zero solids concentration yields in both cases a value very close to that expected of water.
KeywordsParticle Shape Aqueous Suspension Pure Silica Solid Volume Fraction Average Particle Diameter
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