A re-examination of the logarithmic dependence of the mean velocity distribution in polymer drag reduced flows shows that drag reducing polymers modify the von Kármán coefficient and, in channel flow, eradicate the log-layer at high drag reductions. It is also found that the “ultimate profile,” corresponding to the state of maximum drag reduction is not logarithmic.
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Re-examining the logarithmic dependence of the mean velocity distribution in polymer drag reduced wall-bounded flow
White, C. M.; Dubief, Y.; Klewicki, J.
Follow Physics of Fluids
, Volume 24 (2)
American Institute of Physics – Feb 1, 2012
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