Generation of a magnetic field by dynamo action in a turbulent flow of liquid sodium

Type Article
Date 2007-01
Language English
Author(s) Monchaux R., Berhanu M., Bourgoin M., Moulin M., Odier Ph., Pinton J. -F., Volk R., Fauve S., Mordant N., Petrelis F., Chiffaudel A., Daviaud F., Dubrulle B., Gasquet C., Marie Louis, Ravelet F.
Affiliation(s) CEA Saclay, CNRS, URA 2464, Direct Sci Mat,Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France.
Ecole Normale Super, CNRS, UMR 8550, Lab Phys Stat, F-75231 Paris, France.
Ecole Normale Super Lyon, Phys Lab, CNRS, UMR 5672, F-69364 Lyon, France.
Source Physical Review Letters (0031-9007) (American Physical Soc), 2007-01 , Vol. 98 , N. 4 , P. -
DOI 10.1103/PhysRevLett.98.044502
WOS© Times Cited 269
Abstract We report the observation of dynamo action in the von Karman sodium experiment, i.e., the generation of a magnetic field by a strongly turbulent swirling flow of liquid sodium. Both mean and fluctuating parts of the field are studied. The dynamo threshold corresponds to a magnetic Reynolds number R-m similar to 30. A mean magnetic field of the order of 40 G is observed 30% above threshold at the flow lateral boundary. The rms fluctuations are larger than the corresponding mean value for two of the components. The scaling of the mean square magnetic field is compared to a prediction previously made for high Reynolds number flows.
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Monchaux R., Berhanu M., Bourgoin M., Moulin M., Odier Ph., Pinton J. -F., Volk R., Fauve S., Mordant N., Petrelis F., Chiffaudel A., Daviaud F., Dubrulle B., Gasquet C., Marie Louis, Ravelet F. (2007). Generation of a magnetic field by dynamo action in a turbulent flow of liquid sodium. Physical Review Letters, 98(4), -. Publisher's official version : https://doi.org/10.1103/PhysRevLett.98.044502 , Open Access version : https://archimer.ifremer.fr/doc/00253/36472/