This paper describes an experimental study of the effects of injecting dilute aqueous polymer solutions into a turbulent boundary layer formed on a flat plate immersed in flowing water.
Hot-film anemometer techniques were employed in the measurement of the velocity profiles, turbulence intensities, and lateral correlation coefficients at a number of locations along the plate. Boundary layer growth parameters and the variation of the local skin friction coefficient were computed from the velocity profile data. The effects of polymer concentration and injection velocity on the local drag reduction are also presented.
It was found that momentum diffusivity was smaller than for pure water, and that the presence of the polymer molecules appeared to promote a more uniform distribution of the size of the turbulent eddies. Also, that the injection rate of a polymer solution can have a pronounced affect on the drag reduction.
Latto, Brian and Shen, Chi-Hung, "Experimental Investigation of Polymer Solution Injection on External Boundary Layers" (1969). Symposia on Turbulence in Liquids. 57.
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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