Free Surface Controlled by Magnetic Fields

摘要

In metallurgy it is needed to master the shape or the motion of the liquid metal free surface. The present paper reviews some effects of a magnetic field on the behaviour of liquid metal free surfaces. First, the various effects associated with A.C. fields are presented, static dome shaping, dome oscillation, instability, emulsion. Then, the case of a DC magnetic field is presented. Such field is generally stabilising. Nevertheless, in particular case, its application may promote low frequency oscillations. Finally, the effects of magnetic field exhibiting more than one frequency are presented. All these cases are illustrated by photographies produced in the EPM-Madylam laboratory.