Flow Behavior of Polyacrylamide Solution.III.Mathematical Treatment

摘要

The flow behavior of polyacrylamide solutions was systematically deter-mined over a wide range of temperatures (20-50 deg C) and concentrations (20-50 ppm) by using a coaxial cylinder viscometer.The results indicated that the rheological behavior of low-concentration polyacrylamide solution behaves similar to non-Newtonian fluids at all these concentrations.The effect of temperature on the consistency coefficient and flow behavior index of polyacrylamide solution of the different concentrations followed an Arrhenius-type relationship.Moreover,the effect of concentration on consistency coefficient and flow behavior index followed an exponential-law relationship at the temperatures used.The rheological constants for the Arrhenius and exponential-law models were determined.The combined effect of temperature and concentration on the coefficient of dynamic shear stress can be represented by a single equation:shear stress =2.446 X10 ~(-7) exp(0.0639C+3613/RT).