Abstract
WHEN certain long-chain polymers are added to water, the drag exerted by the solution on fixed boundaries is reduced1. Although this applies to both internal and external flows, evidence indicates that the effect occurs only in the turbulent regime, at least for steady flow. The work reported here deals with the forced oscillation of a liquid column contained within a semicircular manometer tube, and shows that the addition of a polymer produces a reduction in drag when the flow is laminar.
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DRIELS, M., AYYASH, S. Drag reduction in laminar flow. Nature 259, 389–390 (1976). https://doi.org/10.1038/259389a0
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DOI: https://doi.org/10.1038/259389a0
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