Summary
The paper deals with results of an experimental study on drag reduction by adding polymer solution into a developing flow within a rectangular duct. The length of the duct was 2.5 m. The idea that considerable savings on polymers can be obtained by this method is tested.
Only the results of injection into top and bottom and side walls of the duct will be presented whereas the results on circumferential injection will be shown elsewhere.
The measurements of two velocity components were carried out by an LDV in five cross sections downstream from the point of injection.
The local values of the drag reduction, mean values of the velocities and turbulence intensities are presented along with the power spectrum density functions. It is shown that extremely high local values of drag reduction can be obtained by this method with very low average concentration of polymer solution.
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© 1985 Springer, Berlin Heidelberg
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Maksimović, Č. (1985). Turbulence Structure of a Developing Duct Flow with Near-Wall Injection of Drag Reducing Polymers. 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_29
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DOI: https://doi.org/10.1007/978-3-642-82632-0_29
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