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Λ-Shaped Vortices in Dilute Polymer Solutions

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Structure of Turbulence and Drag Reduction

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Abstract

The effect of polymer additives on plane Poiseuille flow was investigated in a turbulent flow and a transitional flow. In a turbulent flow, frictional drag was measured. In a transitional flow, we maintained a laminar flow at a Reynolds number higher than the minimum critical Reynolds number and visualized the growth of A-shaped vortices artificially created in the flow. The results showed that polymer additives reduced the frictional drag in a turbulent flow and increased the spanwise wave length of A-shaped vortices in a transitional flow. It is known that polymer additives increase the spanwise spacing of bursts in a turbulent flow. Therefore polymer additives increase the spanwise spacing of the coherent structures in both a turbulent flow and a transitional flow.

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References

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Author information

Authors and Affiliations

  1. Faculty of Engineering, Tokyo Metropolitan University, Tokyo, Japan

    H. Mizunuma, H. Kato & T. Kurita

Authors
  1. H. Mizunuma
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  2. H. Kato
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  3. T. Kurita
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Editor information

Editors and Affiliations

  1. Institut für Hydromechanik und Wasserwirtschaft, ETH Zürich, 8093, Zürich-Hönggerberg, Schweiz

    Albert Gyr

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© 1990 Springer-Verlag Berlin Heidelberg

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Mizunuma, H., Kato, H., Kurita, T. (1990). Λ-Shaped Vortices in Dilute Polymer Solutions. In: Gyr, A. (eds) Structure of Turbulence and Drag Reduction. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-50971-1_21

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  • DOI: https://doi.org/10.1007/978-3-642-50971-1_21

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-50973-5

  • Online ISBN: 978-3-642-50971-1

  • eBook Packages: Springer Book Archive

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