DEAN'S FLOW OF AQUEOUS SOLUTION OF POLY(ETHYLENE OXIDE)

Kim Y; Yi MK; Kim C

Korean Journal of Chemical Engineering, Vol.13, No.1, 40-45, January, 1996

In this research the flow of Newtonian and drag reducing fluids through a helical tube, i.e., Dean’s flow, was experimentally studied. The primary concern was to investigate the effect of added polymer on the secondary motion caused by the centrifugal force. The polymer chosen in this study was poly(ethylene oxide) with the molecular weights of 300,000, 900,000 and 4,000,000 and the solvent was distilled water. The concentration range was 0 to 100 wppm. The Dean number investigated was in the range of 10 to 20,000. In the case of distilled water, the experimental data were in good agreement with the literature. In the case of polymer solutions, it was found that the secondary motion was suppressed as the concentration and molecular weight increased. However, if the molecular weight or concentration exceeded certain values, the effects were saturated. The results were also analyzed from the view point of drag reduction phenomena.

[References]

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[1] Barns HA, Walters K, Proc. Roy. Soc. Lond. A, 314, 85 (1969)

[2] Berger SA, Talbot L, Yao LS, Annu. Rev. Fluid Mech., 15, 461 (1983)

[3] Brennen C, Gadd GE, Nature, 215, 1368 (1967)

[4] Donohue GL, Tiederman WG, Reischman MM, J. Fluid Mech., 56, 559 (1972)

[5] Dunlop EH, Cox LR, Phys. Fluids, 20, S203 (1977)

[6] Eckelmann H, "The Structure Near the Wall in Turbulent Shear Flow," The Influence of polymer Additives on Velocity and Temperature Fields, B. Gampert Ed., Springer Verlag, Berlin (1985)

[7] Hinch EJ, Elata C, Non-Newt. Fluid Mech., 5, 411 (1979)

[8] Jones WM, Davies OH, J. Phys. D: Appl. Phys., 9, 753 (1976)

[9] Layec-Raphalen MN, Layec Y, "Influence of Molecular Parameters on Laminar Non-Newtonian and on Turbulent Flows of Dilute Polymer Solutions," The Influence of Polymer Additives on Velocity and Temperature Fields, B. Gampert Ed., Springer Verlag, Berlin (1985)

[10] McConalogue DJ, Srivastava RS, Proc. Roy. Soc. Lond. A, 307, 37 (1968)

[11] Morgan SE, McCormick CL, Prog. Polym. Sci., 15, 103 (1990)

[12] Paterson RW, Abernathy FH, J. Fluid Mech., 51, 177 (1972)

[13] Tsang HY, James DF, J. Rheol., 24, 589 (1980)

[14] Virk PS, AIChE J., 21, 625 (1975)

[15] Wang CY, J. Fluid Mech., 108, 185 (1981)