INITIAL DISTRIBUTION OF VELOCITY FLUCTUATIONS IN A HAGEN-POISEUILLE JET
V. V. Lemanov, V. V. Lukashov, K. A. Sharov
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Hagen-Poiseuille flow, laminar jet, Schlichting distribution, velocity fluctuation
Abstract
The distributions of velocity fluctuations in a Hagen-Poiseuille flow are obtained experimentally for various Reynolds numbers and pipe diameters. The longitudinal velocity fluctuation distribution is found to peak on the axis and to be independent of the Reynolds number. As the Reynolds number increases, the turbulence intensity in the tube decreases, while the root-mean-square value of the fluctuations increases. Velocity fluctuations (less than 2%) in the Hagen-Poiseuille flow are shown to have virtually no effect on the jet outflow from long pipes.
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