Effect of Electromagnetic Brake on Transient Asymmetric Flow, Solidification, and Inclusion Transport in a Slab Continuous Casting

Abstract

A large eddy simulation model is developed to investigate the transient fluid flow, solidification, and inclusion transport in a slab continuous casting mold under different electromagnetic brake (EMBr) magnetic flux densities. The accuracy of the mathematical model is demonstrated by comparing the magnetic flux density and flow field to measured data. The results show that the flow field is transiently asymmetric and fluctuant without EMBr; the variation of the solidified shell and the distribution of captured inclusion are closely related to the flow pattern. EMBr can significantly alter the flow pattern inside the mold, improve the transient asymmetry of the flow field, and reduce the percentage of captured inclusions. When the upper magnetic field (B U) is not applied, the flow velocity at the upper region of the mold increases, which can promote inclusion removal from the top surface, whereas the solidified shell fluctuates visibly. When the magnitude of B U is increased, the flow near the meniscus is suppressed, the uniformity of solidified shell thickness is improved, and the rate of captured inclusions inside the solidified shell decreases, while the large B U would causes a stagnant flow field near the meniscus.