Propagation characteristics of surface wave on free surface of a molten metal induced by imposition of intermittent alternating magnetic field

In order to increase an interfacial area for the promotion of mass transfer in refining processes, a new method exciting surface wave on a molten meta l has been proposed in the way introducing an intermittent alternating magn etic field with the stepwise change of amplitude. For investigating charact eristics of the induced surface waves, their behavior on a liquid gallium w as measured by use of a laser level sensor and a high speed camera by chang ing values of a magnetic field and an intermittent frequency. Increase in t he amplitude of the magnetic field provided a liquid metal disturbance, whi ch propagated on the liquid metal surface to a center of a vessel with a co nstant velocity, in the vicinity of a wall. Although, propagating velocity of the surface wave slightly increased at a center of a vessel. Propagating velocity of the surface wave increased with increasing in the magnetic fie ld and was independent of the intermittent frequency. Both the width and th e height of the surface wave increased during its propagation from the wall to the center so as to keep the constant wave volume. Increase in the magn etic field changed the height and the volume of the wave while the wave wid th was kept constant. Increase in propagating velocity of the surface wave might be caused by increase in the height of surface wave. A part of charac teristics of surface wave could be explained by Stokes wave theory.