Abstract
THERE have been several experiments in which the turbulent skin friction in pipe flow is reduced by adding certain soluble macromolecular polymers to a flowing solvent. The polymers do not seem to affect the turbulence in the core of the flow1, but rather cause a thickening of the viscous sublayer2. Drag reduction, it seems, requires the presence of a wall.
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References
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Jackley, D. N., Intern. Shipbuild. Prog., 14, No. 152 (1967).
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BATE, H. Orifice Plate Calibration in a Dilute Polymer Solution. Nature 216, 1100–1101 (1967). https://doi.org/10.1038/2161100a0
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DOI: https://doi.org/10.1038/2161100a0
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