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

R. Monchaux; M. Berhanu; M. Bourgoin; M. Moulin; Ph Odier; J. F. Pinton; R. Volk; S. Fauve; N. Mordant; F. Pétrélis; A. Chiffaudel; F. Daviaud; B. Dubrulle; C. Gasquet; L. Marié; F. Ravelet

doi:10.1103/PhysRevLett.98.044502

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

R. Monchaux, M. Berhanu, M. Bourgoin, M. Moulin, Ph Odier, J. F. Pinton, R. Volk, S. Fauve, N. Mordant, F. Pétrélis, A. Chiffaudel, F. Daviaud, B. Dubrulle, C. Gasquet, L. Marié, F. Ravelet

Research output: Contribution to journal › Article › peer-review

Abstract

We report the observation of dynamo action in the von Kármán 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 Rmâ 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.

Original language	English
Article number	044502
Journal	Physical Review Letters
Volume	98
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.98.044502
Publication status	Published - 1 Jan 2007
Externally published	Yes

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Monchaux, R., Berhanu, M., Bourgoin, M., Moulin, M., Odier, P., Pinton, J. F., Volk, R., Fauve, S., Mordant, N., Pétrélis, F., Chiffaudel, A., Daviaud, F., Dubrulle, B., Gasquet, C., Marié, L., & Ravelet, F. (2007). Generation of a magnetic field by dynamo action in a turbulent flow of liquid sodium. Physical Review Letters, 98(4), Article 044502. https://doi.org/10.1103/PhysRevLett.98.044502

@article{c04812e3d83847ee9af5a6b29bc20126,

title = "Generation of a magnetic field by dynamo action in a turbulent flow of liquid sodium",

abstract = "We report the observation of dynamo action in the von K{\'a}rm{\'a}n 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 Rm{\^a} 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.",

author = "R. Monchaux and M. Berhanu and M. Bourgoin and M. Moulin and Ph Odier and Pinton, \{J. F.\} and R. Volk and S. Fauve and N. Mordant and F. P{\'e}tr{\'e}lis and A. Chiffaudel and F. Daviaud and B. Dubrulle and C. Gasquet and L. Mari{\'e} and F. Ravelet",

year = "2007",

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doi = "10.1103/PhysRevLett.98.044502",

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Monchaux, R, Berhanu, M, Bourgoin, M, Moulin, M, Odier, P, Pinton, JF, Volk, R, Fauve, S, Mordant, N, Pétrélis, F, Chiffaudel, A, Daviaud, F, Dubrulle, B, Gasquet, C, Marié, L & Ravelet, F 2007, 'Generation of a magnetic field by dynamo action in a turbulent flow of liquid sodium', Physical Review Letters, vol. 98, no. 4, 044502. https://doi.org/10.1103/PhysRevLett.98.044502

TY - JOUR

T1 - Generation of a magnetic field by dynamo action in a turbulent flow of liquid sodium

AU - Monchaux, R.

AU - Berhanu, M.

AU - Bourgoin, M.

AU - Moulin, M.

AU - Odier, Ph

AU - Pinton, J. F.

AU - Volk, R.

AU - Fauve, S.

AU - Mordant, N.

AU - Pétrélis, F.

AU - Chiffaudel, A.

AU - Daviaud, F.

AU - Dubrulle, B.

AU - Gasquet, C.

AU - Marié, L.

AU - Ravelet, F.

PY - 2007/1/1

Y1 - 2007/1/1

N2 - We report the observation of dynamo action in the von Kármán 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 Rmâ 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.

AB - We report the observation of dynamo action in the von Kármán 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 Rmâ 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.

U2 - 10.1103/PhysRevLett.98.044502

DO - 10.1103/PhysRevLett.98.044502

M3 - Article

AN - SCOPUS:33846546979

SN - 0031-9007

VL - 98

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 044502

ER -

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

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