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Archive Ouverte HAL-IRD |  |
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Archive Ouverte HAL-IRD | |
| HAL : hal-00602640, version 2 |
| arXiv : 1106.4727 |
| DOI : 10.1063/1.3633090 |
| Fiche détaillée |  Récupérer au format |
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| Physics of Fluids 23, 9 (2011) 096601 |
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| Versions disponibles : | v2 (25-06-2011) |
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| Experimental evidence of Alfvén wave propagation in a Gallium alloy |
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| Thierry Alboussiere 1, 2Philippe Cardin 1 |
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| (23/06/2011) |
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| Experiments with a liquid metal alloy, galinstan, are reported and show clear evidence of Alfvén wave propagation as well as resonance of Alfvén modes. Galinstan is liquid at room temperature, and although its electrical conductivity is not as large as that of liquid sodium or NaK, it has still been possible to study Alfvén waves, thanks to the use of intense magnetic fi elds, up to 13 teslas. The maximal values of Lundquist number, around 60, are similar to that of the reference experimental study by Jameson [1]. The generation mechanism for Alfvén waves and their refl ection is studied carefully. Numerical simulations have been performed and have been able to reproduce the experimental results despite the fact that the simulated magnetic Prandtl number was much larger than that of galinstan. An originality of the present study is that a poloidal disturbance (magnetic and velocity fields) is generated, allowing us to track its propagation from outside the conducting domain, hence without interfering. |
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| 1 : | Institut des sciences de la Terre (ISTerre) |
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CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – Institut de recherche pour le développement [IRD] : UR219 |
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| 2 : | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) |
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CNRS : UMR5276 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure - Lyon |
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| 3 : | Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI) |
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CNRS : UPR3228 |
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| 4 : | Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur [Orsay] (LIMSI) |
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CNRS : UPR3251 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris XI - Paris Sud |
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| Geodynamo |
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| Domaine | : | Physique/Physique/Dynamique des Fluides Planète et Univers/Sciences de la Terre/Géophysique Physique/Physique/Géophysique Sciences de l'environnement/Milieux et Changements globaux Planète et Univers/Astrophysique/Astrophysique stellaire et solaire Physique/Astrophysique/Astrophysique stellaire et solaire Planète et Univers/Astrophysique/Astrophysique galactique Physique/Astrophysique/Astrophysique galactique |
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| Diffusion – flow simulation – gallium alloys – indium alloys – liquid alloys – magnetohydrodynamic waves – magnetohydrodynamics – numerical analysis – tin alloys |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00602640, version 2 | |
| http://hal.archives-ouvertes.fr/hal-00602640 | |
| oai:hal.archives-ouvertes.fr:hal-00602640 | |
| Contributeur : Thierry Alboussiere | |
| Soumis le : Samedi 25 Juin 2011, 00:32:04 | |
| Dernière modification le : Lundi 26 Mars 2012, 09:43:57 | |
