EVALUATING SHEAR RATES FOR POWER LAW FLUIDS IN MIXER VISCOMETRY
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Established mixer viscometry methods, the viscosity matching and the slope methods, were evaluated for determining average shear rates when agitating timeindependent, nonNewtonian fluids. Results indicate that the use of a constant value of the mixer proportionally constant, k', is not valid for all ranges of fluid rheological properties, system geometry (impeller and cup) and impeller rotational speed. A small impellertocup diameter ratio and impeller rotational speeds greater than .33 rev/s (20 rpm) provide the optimum operating parameters for evaluation of k'. Copyright 1990, Wiley Blackwell. All rights reserved