Evaluation of Influence of Time-Varying Electromagnetic Component in M-EMS on Flow at Free Surface

Abstract

In the continuous casting process, the surface quality of the steel is as important as its productivity. The surface quality is mostly decided in the molten metal flow during the initial solidification stage, which progresses at the free surface of the molten steel. To improve the surface quality, this flow must be controlled. M‐EMS generates a time‐varying electromagnetic force, which helps to control the shape of the free surface. In this paper, we evaluate the possibility of controlling the flow at the free surface by MHD calculations. The results show a slight possibility for the flow at the free surface to be controlled. Although the free surface variation in a pulsed EMC process, which controls the shape of the free surface using the time‐varying electromagnetic force component, depends on electromagnetic force, the time‐varying component in the M‐EMS depends on the velocity of the molten metal. Since there is a first‐order lag between the electromagnetic force and this velocity, free surface variation in M‐EMS does not linearly depend on the time‐varying electromagnetic component. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 177(3): 62–68, 2011; Published online in Wiley Online Library (http://www.wileyonlinelibrary.com). DOI 10.1002/eej.21167