Comptes Rendus
Velocity and concentration distributions in globally unstable axisymmetric helium jets
Comptes Rendus. Mécanique, Volume 335 (2007) no. 8, pp. 449-454.

We study the distribution of the velocities and concentrations in the near-field of axisymmetric pure helium jets, issuing into air at rest. Helium mass concentrations are deduced from O2 partial pressure measurements and velocity profiles are obtained by laser Doppler velocimetry. The characteristic frequencies of the globally unstable jets are deduced from fast flow visualization and associated image processing.

Nous étudions la distribution des vitesses et des concentrations dans des jets axisymétriques d'hélium pur en proche sortie de buse, s'épanouissant dans de l'air au repos. Les concentrations massiques d'hélium sont obtenues via des mesures de pression partielle d'oxygène et les vitesses sont obtenues par vélocimétrie laser Doppler. Les fréquences caractéristiques des jets globalement instables sont déduites de l'analyse d'images obtenues par visualisation rapide.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2007.05.021
Keywords: Fluid mechanics, Jet, Instability, Variable density
Mot clés : Mécanique des fluides, Jet, Instabilité, Masse volumique variable

Sami Boujemaa 1, 2; Muriel Amielh 1; Marie Pierre Chauve 1

1 Institut de recherche sur les phénomènes hors équilibre, technopôle Château Gombert, 49, rue F. Joliot-Curie, B.P. 146, 13384 Marseille cedex 13, France
2 Faculté des sciences de Tunis, département de physique, campus universitaire Le Belvédère, 1060 Tunis, Tunisia
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Sami Boujemaa; Muriel Amielh; Marie Pierre Chauve. Velocity and concentration distributions in globally unstable axisymmetric helium jets. Comptes Rendus. Mécanique, Volume 335 (2007) no. 8, pp. 449-454. doi : 10.1016/j.crme.2007.05.021. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.05.021/

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