Velocity and concentration distributions in globally unstable axisymmetric helium jets

Sami Boujemaa; Muriel Amielh; Marie Pierre Chauve

doi:10.1016/j.crme.2007.05.021

Velocity and concentration distributions in globally unstable axisymmetric helium jets
[Distributions de vitesses et de concentrations dans des jets axisymétriques d'hélium globalement instables]

Présenté par : Paul Clavin

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

Comptes Rendus. Mécanique, Volume 335 (2007) no. 8, pp. 449-454.

Résumé
Abstract

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.

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.

Reçu le : 2007-03-14
Accepté le : 2007-05-22
Publié le : 2007-07-03

DOI : 10.1016/j.crme.2007.05.021

Keywords: Fluid mechanics, Jet, Instability, Variable density
Mots-clés : Mécanique des fluides, Jet, Instabilité, Masse volumique variable

Affiliations des auteurs :

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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     author = {Sami Boujemaa and Muriel Amielh and Marie Pierre Chauve},
     title = {Velocity and concentration distributions in globally unstable axisymmetric helium jets},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {449--454},
     publisher = {Elsevier},
     volume = {335},
     number = {8},
     year = {2007},
     doi = {10.1016/j.crme.2007.05.021},
     language = {en},
}

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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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