Abstract
Measurements of the vortex-shedding frequency in the flow past small circular cylinders (d ~ 0.2÷2mm) in a wide range of Reynolds numbers (Re ~ 10÷1000) are presented. The measurements were performed both in water and in dilute drag-reducing polymer solutions by means of Laser-Doppler anemometry. The data measured in water were in good agreement with similar data obtained by others (e.g. Roshko [15], Berger & Wille [2]). In the presence of polymer additives the onset of the vortex-shedding occurred at smaller Reynolds number (Re≈13) and the Strouhal number decreased considerably with increasing of polymer concentration and/or decreasing cylinder diameter. No influence of polymer additives was observed for cylinder diameters larger than 2mm. These results agree with previous investigations [4,8,9] for very thin cylinders and with [16] for much larger cylinders.
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© 1985 Springer, Berlin Heidelberg
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Kit, E., Rosentraub, Z. (1985). Laser-Doppler Measurements of Vortex-Shedding Past Small Circular Cylinders in Dilute Polymer Solutions. 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_21
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DOI: https://doi.org/10.1007/978-3-642-82632-0_21
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