Velocity fluctuations in the Reynolds experiment at low degree of supercriticality

V. V. Lemanov, V. V. Lukashov, K. A. Sharov

S.S. Kutateladze Institute of Thermophysics, Siberian Division of the Russian Academy of Sciences, Novosibirsk, Russia

Abstract: The results of an experimental study of the distribution of velocity fluctuations in the Reynolds experiment at low degree of supercriticality $n$ = 0–0.3 are presented. It is shown that for an intermittent flow in the range of intermittency coefficients of $\gamma$ = 0.5–0.85, the distribution of fluctuations over the cross section has three maxima. The results obtained are in good agreement with the previously obtained theoretical estimates.

Keywords: laminar-turbulent transition, Reynolds experiment, low degree of supercriticality, intermittency, turbulent structures.

Received: 07.09.2023
Revised: 27.10.2023
Accepted: 07.11.2023

DOI: 10.61011/PJTF.2024.03.57039.19725

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