Author： Gallet B. Pétrélis F. Fauve S.
Publisher： Edp Sciences
E-ISSN： 1286-4854|97|6|69001-69001
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.97, Iss.6, 2012-03, pp. : 69001-69001
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
We show that a simple flow of an electrically conducting fluid along a boundary with variable magnetic permeability can generate a magnetic field. An analytic study in the limit of weak permeability modulation allows to understand the mechanism of this dynamo and predicts scaling laws for the threshold. We discuss the possible contribution of this mechanism to the dynamo observed in the von Karman sodium experiment and we propose two flow configurations that could lead to the experimental observation of this new type of dynamo.
Related content
On magnetic instabilities and dynamo action in stellar radiation zones
Astronomy & Astrophysics, Vol. 474, Iss. 1, 2007-10 ,pp. :
Access to resources
Recommend
Numerical insights into magnetic dynamo action in a turbulent regime
New Journal of Physics, Vol. 9, Iss. 8, 2007-08 ,pp. :
Access to resources
Dynamo action and magnetic buoyancy in convection simulations with vertical shear
Astronomy & Astrophysics, Vol. 533, Iss. issue, 2011-08 ,pp. :
Dynamo action in turbulent flows
Astronomy & Astrophysics, Vol. 410, Iss. 3, 2003-11 ,pp. :
EAS Publications Series, Vol. 21, Iss. issue, 2006-06 ,pp. :