The Influence of Concentration and Particle Shape on the Rheology of Silica, Flyash and Other Industrial Slurries

  • R. L. Jones
  • R. R. Horsley


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.


Particle Shape Aqueous Suspension Pure Silica Solid Volume Fraction Average Particle Diameter 
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Copyright information

© Elsevier Science Publishers Ltd 1990

Authors and Affiliations

  • R. L. Jones
    • 1
  • R. R. Horsley
    • 2
  1. 1.Department of BiochemistryUniversity of the WitwatersrandJohannesburgSouth Africa
  2. 2.Department of Mechanical EngineeringCurtin University of TechnologyPerthWestern Australia

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