https://doi.org/10.1007/s100510070239
Magnetic induction by coherent vortex motion
1
Laboratoire de PhysiqueCNRS, UMR 5672,
École Normale Supérieure de Lyon,
46 allée d'Italie, 69007 Lyon, France
2
Laboratoire de Physique StatistiqueCNRS, UMR 8550,
École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France
Received:
27
October
1999
Revised:
16
March
2000
Published online: 15 July 2000
We investigate experimentally the advection of a magnetic field by a flow of conducting fluid, at moderate magnetic Reynolds numbers. More specifically, we study the influence of a large scale intense vortex on an externally applied field. We show that at large scales the magnetic field lines are distorted in a way that is consistent with a scenario of magnetic field expulsion by vorticity. Measurements at small scales show that the magnetic fluctuations are also quite sensitive to the large scale vortex motion.
PACS: 47.27.-i – Turbulent flows, convection, and heat transfer / 47.65.+a – Magnetohydrodynamics and electrohyrodynamics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
