Flow Control in Continuous Slab Casting by Local Electromagnetic Braking
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Various quality problems emerging in the final product of the continuous casting of steel can be related to an insufficient control of the steel flow in the mold. To meet the requirements of high-quality products, electromagnetic forces are utilized to control the steel flow, and hence to improve the product quality. The usage of electromagnetic fields gained momentum in recent years due to their contactless way of flow control. In principle, the local electromagnetic brake can be placed above or beneath the jet in the mold region. In the current work, the local electromagnetic brake is applied beneath the jet to deflect the jets upward. The resulting braking forces will decrease the jet momentum, reduce the surface velocity, and lower the free surface elevation. The results were also compared with casting speed of 1.4 m/min (no brake), which poses as the reference case with an optimal flow. The numerical investigations are performed using Ansys Fluent with the SAS (Scale Adaptive Simulation) turbulence model. The first results show that the application of EMBr reduces the velocities in the entire mold region and bends the jets more upward. Consequently, the upward-deflected jets impinge at higher positions on the narrow faces and dampen the lower vortices.