It is of great importance to remove the inclusions as much as possible in the molten steel. The inclusion collision rate is significantly improved by generating centrifugal flow in the tundish with an electromagnetic device, which induces the inclusions to grow and float. However, the electromagnetic device requires an external equipment component that is difficult to maintain. Additionally, a turbulence inhibitor is commonly used to optimize the turbulence flow in the tundish. This paper describes a novel tundish design with a turbulence inhibitor that generates swirl flow in a cylindrical zone, which produced an effect similar to the electromagnetic device. The gravitational potential energy of the molten steel from the nozzle is converted into kinetic energy of the swirling flow in the tundish. The inclusion removal rates with various nozzle diameters were investigated, and the optimal turbulence inhibitor size and structure were identified by numerical simulation.
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The authors are especially grateful to the grants from the National Natural Science Foundation of China (Grant No. 51704052 and No. 51874061) for their financial support.
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