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Article Dans Une Revue Physical Review Letters Année : 2003

Nonlinear magnetic induction by helical motion in a liquid sodium turbulent flow

Résumé

We report an experimental study of the magnetic field (B) over right arrow induced by a turbulent swirling flow of liquid sodium submitted to a transverse magnetic field (B) over right arrow (0). We show that the induced field can behave nonlinearly as a function of the magnetic Reynolds number, R-m. At low R-m, the induced mean field along the axis of the flow, , and the one parallel to (B) over right arrow (0), , first behave like R-m(2), whereas the third component, , is linear in R-m. The sign of is determined by the flow helicity. At higher R-m, (B) over right arrow strongly depends on the local geometry of the mean flow: decreases to zero in the core of the swirling flow but remains finite outside. We compare the experimental results with the computed magnetic induction due to the mean flow alone.
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Dates et versions

hal-00492370 , version 1 (15-06-2010)

Identifiants

Citer

François Pétrélis, Mickaël Bourgoin, Louis Marie, Javier Burguete, Arnaud Chiffaudel, et al.. Nonlinear magnetic induction by helical motion in a liquid sodium turbulent flow. Physical Review Letters, 2003, 90 (17), pp.174501. ⟨10.1103/PhysRevLett.90.174501⟩. ⟨hal-00492370⟩
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