Abstract
SMALL quantities of certain polymers dissolved in a liquid can reduce considerably the frictional drag exerted by the liquid when it flows over a surface. This effect has been observed with various solvent/polymer combinations, but most investigations involve polyethyleneoxide (PEO), polyacrylamide or guar gum in water, where the concentrations required are of the order of a few parts per million.
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Cox, L., DUNLOP, E. & NORTH, A. Role of molecular aggregates in liquid drag reduction by polymers. Nature 249, 243–245 (1974). https://doi.org/10.1038/249243a0
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DOI: https://doi.org/10.1038/249243a0
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