Abstract
Rheological properties of aqueous polyacrylamide solutions have been measured in shear and extensional flows. Elongational viscosity measurements were performed with an opposed-nozzles stressmeter. The FENE-P constitutive model is used for describing the rheological properties of the solution. A single relaxation time is sufficient to give satisfactory agreement between the FENE-P model and the measured properties. In view of the fact that the flow in the opposing jets device is not purely extensional, a numerical simulation of the flow is made in order to interpret experimental results.
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