Abstract
Turbulent characteristics of a drag-reducing surfactant solution in a two-dimensional channel flow are measured by means of a hot-film anemometer. It is confirmed for the drag-reducing flow that the mean velocity profiles on the semilogarithmic plot are S-shaped at high drag reduction and the ratio of the wall-normal turbulence intensity υ'rms to the streamwise u'rms is constant within a region near the wall. At a distance from the wall, the large-amplitude turbulent velocity fluctuations are more intermittent than in the corresponding water flow. The generation of Reynolds shear stress is maximized in a very-low-frequency range of turbulent fluctuations. The energy content of the turbulent fluctuations decreases at the intermediate frequency range.
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