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The effect of polymer additives on transition in pipe flow

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Summary

Small amounts of long chain water soluble polymers have a marked effect on turbulent flow resulting in an appreciable reduction of turbulent friction. The maximum reduction in pipe flow resistance is obtained at such low concentrations that the density and viscosity are not altered appreciably. The minimum friction curve varies as Re −2/3 and appears to be the same for all effective additives tested. The transition process is affected by these additives. Quantitative results are presented showing a reduction in the intensity of the turbulent flashes and the fraction of the time the flow is turbulent at a given Reynolds number.

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Author notes

  1. Walter Castro

    Present address: Clemson University, Clemson, S. C., USA

Authors and Affiliations

  1. West Virginia University, Morgantown, W. Va., USA

    Walter Castro & William Squire

Authors
  1. Walter Castro
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  2. William Squire
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Castro, W., Squire, W. The effect of polymer additives on transition in pipe flow. Appl. Sci. Res. 18, 81–96 (1968). https://doi.org/10.1007/BF00382338

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  • DOI: https://doi.org/10.1007/BF00382338

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