[La convection engendrée par forçage radiatif, ou comment reproduire en laboratoire les régimes « ultimes » des écoulements géo- et astrophysiques]
Cet article traite du transport turbulent de chaleur engendré par convection thermique. Si la croyance dominante est que les propriétés de transport de l’écoulement turbulent sont asymptotiquement indépendantes des diffusivités moléculaires du fluide, ce régime dit « ultime » semble difficile à mettre en évidence dans les expériences traditionnelles de laboratoire (dispositif de Rayleigh–Bénard). Nous avons donc récemment développé un dispositif de convection par chauffage radiatif, dans lequel le fluide est chauffé en volume dans sa partie inférieure. Nous montrerons comment ce dispositif conduit naturellement à l’observation du régime ultime de convection thermique en laboratoire. Nous décrirons ensuite l’ajout d’une rotation globale à ce dispositif expérimental, ingrédient important des écoulements géophysiques et astrophysiques. Nous montrerons en particulier comment ce dispositif a permis la première observation expérimentale du régime ultime de convection en rotation rapide, dit régime de « turbulence géostrophique » .
We consider the turbulent heat transport induced by thermal convection. The widespread belief is that the transport properties of the turbulent flow should be independent of the tiny molecular diffusivities for asymptotically strong driving, but the associated “ultimate” scaling regime proves challenging to observe experimentally using standard convection cells (Rayleigh–Bénard geometry). We thus recently introduced an alternate experimental setup where convection is driven radiatively, with internal heating within the lower region of the body of fluid. This setup naturally leads to the ultimate regime of thermal convection. We then discuss how adding global rotation to the experimental setup has led to the first laboratory observation of the diffusivity-free regime of rapidly rotating turbulent convection, also known as the “geostrophic turbulence” scaling regime.
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Mots-clés : convection turbulente, dynamique des fluides géophysiques et astrophysiques, turbulence en rotation
Gabriel Hadjerci 1 ; Vincent Bouillaut 2 ; Benjamin Miquel 3 ; Sébastien Aumaître 1 ; Basile Gallet 1
CC-BY 4.0
@article{CRPHYS_2024__25_S3_A14_0,
author = {Gabriel Hadjerci and Vincent Bouillaut and Benjamin Miquel and S\'ebastien Auma{\^\i}tre and Basile Gallet},
title = {Radiatively driven convection: diffusivity-free regimes of geophysical and astrophysical flows in the laboratory},
journal = {Comptes Rendus. Physique},
publisher = {Acad\'emie des sciences, Paris},
year = {2024},
doi = {10.5802/crphys.207},
language = {en},
note = {Online first},
}
TY - JOUR AU - Gabriel Hadjerci AU - Vincent Bouillaut AU - Benjamin Miquel AU - Sébastien Aumaître AU - Basile Gallet TI - Radiatively driven convection: diffusivity-free regimes of geophysical and astrophysical flows in the laboratory JO - Comptes Rendus. Physique PY - 2024 PB - Académie des sciences, Paris N1 - Online first DO - 10.5802/crphys.207 LA - en ID - CRPHYS_2024__25_S3_A14_0 ER -
%0 Journal Article %A Gabriel Hadjerci %A Vincent Bouillaut %A Benjamin Miquel %A Sébastien Aumaître %A Basile Gallet %T Radiatively driven convection: diffusivity-free regimes of geophysical and astrophysical flows in the laboratory %J Comptes Rendus. Physique %D 2024 %I Académie des sciences, Paris %Z Online first %R 10.5802/crphys.207 %G en %F CRPHYS_2024__25_S3_A14_0
Gabriel Hadjerci; Vincent Bouillaut; Benjamin Miquel; Sébastien Aumaître; Basile Gallet. Radiatively driven convection: diffusivity-free regimes of geophysical and astrophysical flows in the laboratory. Comptes Rendus. Physique, Online first (2024), pp. 1-16. doi : 10.5802/crphys.207.
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