The paper reports an experimental study of the flow of homogeneous aqueous polyacrylamide MRL 402 solution over a thin flat plate. Extensive velocity profile data were obtained, using both cylindrical and conical hot-file probes, and used to obtain local skin friction profiles. Direct drag measurements were made over a period of time for concentrations of 0, 25, 50 and 75 wppm and indicated that there was no appreciable degradation of the polymer. Extensive turbulence intensity data were obtained which were contradictory but indicated that the conical type probe is better than the cylindrical type for turbulence measurements and that the turbulence intensity reduced as the fluid progressed along the surface. Results indicate that the form drag is reduced but that the viscous drag is not reduced unless an onset friction velocity is exceeded, which was found to be 0.074 ft/sec for the polymer used.
Latto, Brian and Middleton, J. A., "Effect of Dilute Polymer Solutions on External Boundary Layers" (1969). Symposia on Turbulence in Liquids. 58.
Symposium on Turbulence Measurements in Liquids (1969: Sep., Rolla, MO)
Chemical and Biochemical Engineering
Article - Conference proceedings
Turbulence Measurements in Modified Fluids
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