Abstract
Experimental friction factor results are presented for aqueous solutions of polyacrylamide (Separan AP-273) for concentrations of 1500 ppm, 2000 ppm and 2500 ppm in laminar and turbulent flow through tubes of 2.21 cm and 1.30 cm inside diameter. The solutions studied show a highly non-Newtonian behavior with values of the flow behavior index varying from 0.45 to 0.90. The measured friction factors are slightly lower than the maximum drag reduction asymptote proposed by Virk. For the concentrated viscoelastic solutions the generalized Reynolds number provides a better presentation of the data than the Reynolds number based on the apparent viscosity. In such a presentation there is no influence of pipe diameter or solution concentration on the friction factor. A power law approximation for the friction factor in terms of the generalized Reynolds number was determined using present experimental data. This expression may be used to represent the maximum drag reduction asymptote.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
