Abstract
Axisymmetric helium jets issuing into still air at low to medium Reynolds numbers are visualized by schlieren and differential interferometric techniques. It is shown that strong self sustaining sinusoidal oscillations set in as soon as Re > 100, a clear manifestation of absolute instability. This is confirmed by hot wire measurements. There is no evidence of pairing. The existence of previously observed side jets is confirmed. It is shown that these develop when the Reynolds number exceeds a critical value and become stronger with increasing Re. Large variations of the spread in the fully turbulent region are also observed. Finally it is shown that none of these phenomena occur in the jet generated from laminar tube flow.
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© 1991 Springer Science+Business Media Dordrecht
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Riva, R., Binder, G., Tardu, S., Favre-Marinet, M. (1991). Visualizations of helium jets in air. In: Metais, O., Lesieur, M. (eds) Turbulence and Coherent Structures. Fluid Mechanics and Its Applications, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7904-9_7
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DOI: https://doi.org/10.1007/978-94-015-7904-9_7
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-4063-3
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