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ABSTRACT
In rheology, the viscosity reduction of suspensions is frequently attributed to the break-down of structure of agglomerates by the shear stress applied. It is also widely known that the addition of dispersant reduces the viscosity. Both phenomena are considered to be closely related via change in number of junctions between the particles.
Starting from the stability theory of suspensions by Verwey and Overbeek22, and separating the time-dependent viscosity from the time-independent viscosity, an equation (12) expressing the increase of junction number as a function of time was derived. By equation (12), calculation of the viscosity of unagitated suspensions, which has not been possible by rheological equations containing the rate of shear as one of the parameters, became possible.