The rheological properties of partially hydrolyzed polyacrylamide(PHP) aqueous solutions at low shear rates have been studied by using a concentric cylinder rotational rheometer. Some rheological parameters: non Newto...The rheological properties of partially hydrolyzed polyacrylamide(PHP) aqueous solutions at low shear rates have been studied by using a concentric cylinder rotational rheometer. Some rheological parameters: non Newtonian index( n ), consistency coefficient( K ), apparent viscosity( η a) and yield stress( τ y) have been determined at conditions of different PHP concentration, temperature and salinity. The results showed that at shear rates of 1～5 s -1 a yield stress occurred, PHP aqueous solution behaved as a Bingham fluid and a linear relationship between τ y and PHP concentration( c ) was obtained: τ y= kc .展开更多
Two assumptions were put forward as a result of analysis of the flow curves of hydrolyzed polyacrylamide-salt solution and the theory of macromolecular solution.The relationships between the zero-shear viscosity η 0 ...Two assumptions were put forward as a result of analysis of the flow curves of hydrolyzed polyacrylamide-salt solution and the theory of macromolecular solution.The relationships between the zero-shear viscosity η 0 and polymer concentrations ρ p,between the constants K and n in Meter’s equation and polymer concentration ρ p were established.Therefore a universal Meter’s equation relating apparent viscosity η a with polymer concentration ρ p was deduced.The equation can be used to simulate apparent viscosity η a for the system,with an average error of 7.9% for experimental values.展开更多
文摘The rheological properties of partially hydrolyzed polyacrylamide(PHP) aqueous solutions at low shear rates have been studied by using a concentric cylinder rotational rheometer. Some rheological parameters: non Newtonian index( n ), consistency coefficient( K ), apparent viscosity( η a) and yield stress( τ y) have been determined at conditions of different PHP concentration, temperature and salinity. The results showed that at shear rates of 1～5 s -1 a yield stress occurred, PHP aqueous solution behaved as a Bingham fluid and a linear relationship between τ y and PHP concentration( c ) was obtained: τ y= kc .
文摘Two assumptions were put forward as a result of analysis of the flow curves of hydrolyzed polyacrylamide-salt solution and the theory of macromolecular solution.The relationships between the zero-shear viscosity η 0 and polymer concentrations ρ p,between the constants K and n in Meter’s equation and polymer concentration ρ p were established.Therefore a universal Meter’s equation relating apparent viscosity η a with polymer concentration ρ p was deduced.The equation can be used to simulate apparent viscosity η a for the system,with an average error of 7.9% for experimental values.
