The time dependence of the viscosities of certain thixotropic fluids has been measured at constant rate of shear, using a Couette type viscometer. A time dependent yield value has been introduced which relates the instantaneous value of the observed viscosity, for a given rate of shear, to a time independent residual viscosity. The transient behaviour of the yield value has also been examined
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E. W. Billington (1960) studied this question.
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