CONTROL OF IMMERSION NOZZLE OUTLET FLOW P ATTERN BY USING SWIRLING FLOW IN CONTINUOUS-CASTING

In conventional continuous casting system, using a submerged nozzle wi th side-pouring holes, it is very difficult to achieve a low and unifo rm velocity distribution of molten metal stream in front of the holes. In order to solve such a problem, fluid flow characteristics impartin g a swirling motion at the entrance region of a nozzle have been inves tigated, using a water model. It has been shown that a uniform velocit y distribution at the outlet can be obtained imparting a swirling moti on in the entrance region of the divergent nozzle. This strongly sugge sts that the outlet flow pattern in the practical continuous caster ca n be controlled by introducing a swirling flow in the molten metal usi ng an externally imposed rotating magnetic field.