Article ID: ISIJINT-2020-592
To investigate the transient multiphase flow, slag entrainment and exposed slag eye in the mold with EMBr and argon injection, a transient multiphase LES model was constructed. In the model, the multiphase (steel-slag-air) flow was simulated through VOF method, argon bubbles were tracked using DPM method. The model was validated by previous experimental measurements through the particle image velocimetry. The results indicated that argon injection weakened the upper recirculation flow, and reduced the molten steel jet downward angle. Moreover, the turbulent flow in the mold was suppressed by EMBr. The slag entrainment mechanisms are different under different conditions. In the case without argon injection and EMBr, three slag entrainment mechanisms were found: shear flow, Von Kármán vortex, and level fluctuation. Nevertheless, when argon was injected, in addition to the above mechanisms, one extra mechanism was predicted that was bubble interaction. Additionally, bubble interaction was the unique slag entrainment mechanism in the case with argon injection and EMBr. The impact of argon bubbles on the steel-slag interface resulted in exposed slag eye. In the case without EMBr, the exposed slag eye phenomenon was intermittent. However, the phenomenon was persistent when EMBr was applied.