The flow of a dilute cationic surfactant solution past a circular cylinder |
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| Authors: | C Bergins M Nowak M Urban |
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| Institution: | (1) Department of Chemical Engineering Chair of Energy Process Engineering and Fluid Mechanics University of Dortmund 44221 Dortmund, Germany e-mail: Maik.Nowak@chemietechnik.uni-dortmund.de Tel.: +49-231-7552302; Fax: +49-231-7553209, DE;(2) UC Umwelt Consulting GmbH 45527 Hattingen, Germany, DE |
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| Abstract: | The influence of a dilute solution of the cationic surfactant C14Sal on the flow past a cylinder was investigated by means of LDV and Toepler Schlieren optics for visualization of both the
flow and structure of the fluid. At low Reynolds numbers the flow is similar to the Newtonian Kármán vortex street. The periodic
vortex shedding disappears simultaneously with the occurrence of a shear-induced structure. The alteration of the turbulence
characteristics is especially pronounced in the turbulent velocity fluctuations with the u
rms being many times over the values in water, whereas the v
rms are drastically reduced.
Received: 18 May 2000 / Accepted: 25 July 2000 |
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