Abstract
Flow behavior of suspensions of needle-like pigmental goethite dispersed in ethylene glycol has been studied with the steady-s ate and the step-shear-rate methods. All suspensions exhibited pseudoplastic flow in both methods. In the step-shear-rate method, the dispersing state of powder was assumed to be constant during the measurement. The flow curves in the low shear rate region were expressed by τ=α1/2φF2D1/22+η0(1-φF/0.74)-1.85D (1) where τ is shear stress, D shear rate and φF effective volume fraction of the dispersed phase, a measure of dispersed state. The value of φF at each shear rate was estimated from the results of the step-shear-rate measurements. Applying the value of φF thus obtained to the corresponding shear rate in the steady state flow, steady state flow curves in the high shear rate region were expressed by τ=α1φF2D+η0(1-φF/0.74)-1.85D (2).
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