Abstract
AbstractThe kinetic theory proposed by Soong and Liu for describing the rheological properties of structured fluids has been extended to predict shear‐thinning, shear‐thickening, thixotropy, and antithixotropy in different ranges of shear rates. Viscoelastic properties, as given by the Gordon‐Schowalter Maxwell model, with a non‐constant modulus, have also been considered. The theoretical predictions are compared with the predictions of a model used by Ait‐Kadi, et al. (1988), for a hydrolyzed polyacrylamide solution containing 20 g/1 of NaCl. the predictions and experimental data for the viscosity and primary normal stress coefficient are in reasonably good agreement. The stress growth functions have also been calculated and have been found to be consistent with experimental observations.
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