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.
Experiments in Fluids – Springer Journals
Published: Apr 4, 2001
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