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| Simulation of flow field in a slab continuous casting with in-mold electromagnetic stirring |
| LU Hai-biao1,2, ZHANG Hui-qi1,2, ZHONG Yun-bo1,2, REN Wei-li1,2, LEI Zuo-sheng1,2 |
1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China;
2. Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200444, China |
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Abstract Electromagnetic stirring has great effect on the flow field in the mold and the behavior of steel/slag interface, a physical model of slab mold with similarity ratio of 1∶5 and a mathematical model were built to investigate the effect of electromagnetic stirring (EMS) current on the flow field, the freezing index (Rf) and slag entrapment index (Re) were introduced to evaluate the probability of meniscus freezing and slag entrapment, respectively. The results indicate that the flow field measured by physical model can be using as the validation for mathematical simulation. When EMS is not applied, the flow field within the mold is a classical double-roll structure, the flow velocity at free surface is relatively small, the freezing index and slag entrapment index are 0.52 and 0, respectively. The flow field changes significantly for the case with EMS, a horizonal recirculation flow has generated in the upper part of mold, the flow velocity at free surface increases. With the increase of EMS current, the recirculation flow enhances, the freezing index decreases while the slag entrapment index increases, as the EMS current increases to 700 A, the freezing index and slag entrapment index change to 0.04 and 0.245, respectively. Therefore, considering the slag entrapment index and meniscus freezing index, the optimizing stirring current is 600 A.
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Received: 27 May 2022
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2023, Vol. 42 
