Unstable modes of laminar round fountains on inclined wall

Aymeric Lamorlette; Rabah Mehaddi; Olivier Vauquelin

doi:10.1016/j.crme.2011.01.004

Unstable modes of laminar round fountains on inclined wall

Aymeric Lamorlette ¹ ; Rabah Mehaddi ¹; Olivier Vauquelin ¹

¹ IUSTI (UMR CNRS 6595), Aix-Marseille université, technopôle de Château-Gombert, 60, rue Joliot Curie, 13453 Marseille cedex 13, France

Comptes Rendus. Mécanique, Volume 339 (2011) no. 4, pp. 250-256.

Abstract
Résumé

Experiments were carried out on reversed weak laminar inclined fountains to asses that unstable modes of round fountains are disturbed by the inclination. Indeed, compared to fountains developing on horizontal wall, some modes disappeared while others are split in several modes. This paper aims at describing and mapping these new modes regarding to the inclination and the inlet velocity. Explanations about what made the unstable modes evolve are also proposed.

Des expériences ont été menées sur des fontaines inversées faibles laminaires inclinées qui permettent dʼassurer que les modes instables des fontaines circulaires sont perturbés par lʼinclinaison. En effet, en comparant aux fontaines se développant sur paroi horizontale, certains modes disparaissent alors que dʼautres se séparent en plusieurs modes. Ce papier a pour but de décrire et cerner ces nouveaux modes en fonction de lʼinclinaison et de la vitesse dʼinjection. Des explications concernant lʼorigine de lʼévolution des instabilités sont également proposées.

Received: 2011-01-10
Accepted: 2011-01-26
Published online: 2011-03-02

DOI: 10.1016/j.crme.2011.01.004

Keywords: Fluid mechanics, Laminar fountain, Unstable modes, Inclined wall
Mots-clés : Mécanique des fluides, Fontaine laminaire, Modes instables, Paroi inclinée

Author's affiliations:

Aymeric Lamorlette ¹; Rabah Mehaddi ¹; Olivier Vauquelin ¹

¹ IUSTI (UMR CNRS 6595), Aix-Marseille université, technopôle de Château-Gombert, 60, rue Joliot Curie, 13453 Marseille cedex 13, France

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     author = {Aymeric Lamorlette and Rabah Mehaddi and Olivier Vauquelin},
     title = {Unstable modes of laminar round fountains on inclined wall},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {250--256},
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     volume = {339},
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     year = {2011},
     doi = {10.1016/j.crme.2011.01.004},
     language = {en},
}

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Aymeric Lamorlette; Rabah Mehaddi; Olivier Vauquelin. Unstable modes of laminar round fountains on inclined wall. Comptes Rendus. Mécanique, Volume 339 (2011) no. 4, pp. 250-256. doi : 10.1016/j.crme.2011.01.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2011.01.004/

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