Numerical simulation of slag entrapment process during the end of casting in tundish

作者：Li, Zhonghui; Zhang, Meijie^*; Zhou, Fengming; Lu, Yongming; Zhang, Xiaohong; Gu, Huazhi

来源：Ironmaking and Steelmaking, 2022, 49(10): 1039-1047.

DOI：10.1080/03019233.2022.2078261

• Continuous casting tundish
• slag entrapment
• critical time
• critical height
• end of casting
• numerical simulation
• initial conditions
• casting speed

The slag entrapment process under two different initial conditions during the end of casting in tundish is studied. A 3D multiphase mathematical model was developed to simulate the slag entrapment behaviour. The critical slag entrapment time (t(s)) and the corresponding critical slag entrapment height (h(cs)) were predicted. The results show the h(cs) increases, the t(s) decreases as the casting speed increases, but their relationships are not linear. The influence of casting speed on the h(cs) in the range of 1.25-1.5 m min(-1) is higher than other ranges. The h(cs) simulated from the steady flow field is higher than that from the static state. When the casting speed is 1.50 m min(-1), the difference between the h(cs) calculated from two different initial conditions is the largest, reaching 9.83 mm (8.42%). The numerical simulation results are verified by a 1:2 scaled water model.