Abstract
In order to make use of the electromagnetic force replacing a solid side dam to confine molten metal at the side edges in a twin roll caster, the stability analysis of an electromagnetic dam, where the vertical free surface of molten metal is held without any contact with a solid wall, has been studied. The electromagnetic dam which makes use of the electromagnetic force induced by the static magnetic field and the direct electric current is expected to avoid the troubles caused by the solid side dams in conventional operations. By using the normal mode method developed in the perturbation theory, the effects of operational variables such as imposed electric current, imposed magnetic field, and the imposing direction of magnetic field to that of a wave vector on the stability of the free surface of molten metal have been studied. This stability analysis derives that the better stability are found in the conditions with the less electric current, the stronger magnetic field, and the magnetic field parallel to the direction of a wave vector.
