Abstract
POLYMER solutions which reduce drag friction have been shown1 to have two different physico-mechanical structures; these are characterized by the presence or absence of continuum viscoelastic properties. Both types of solution, however, contain coarse viscoelastic particles—associates of macromolecules which are responsible for hydrodynamic drag reduction near the smooth surface (Toms effect). The effect (positive or negative) of polymer additives on the development of Kármán vortices has been shown to depend on the structure of the solution2.
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VLASOV, S., KALASHNIKOV, V. Turbulent Diffusion of Heat in Jets of Dilute Polymer Solutions. Nature 224, 1195 (1969). https://doi.org/10.1038/2241195a0
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DOI: https://doi.org/10.1038/2241195a0
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