Abstract
Experiments are reported in which.a concentrated polymer solution is injected into the centre of a turbulent pipe flow. Drag reduction is obtained even if the polymer forms a liquid thread which is conveyed in the core region of the flow, i.e. no significant part of the injected polymer is present in the near-wall region. This type of drag reduction differs from that found in homogeneous solutions and seems to be due to an interaction between the polymer thread and the large-scale structure.
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Bewersdorff, HW. (1985). Heterogeneous Drag Reduction in Turbulent Pipe Flow. In: Gampert, B. (eds) The Influence of Polymer Additives on Velocity and Temperature Fields. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82632-0_27
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DOI: https://doi.org/10.1007/978-3-642-82632-0_27
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