Water Modeling on Gas Blowing in Tundish and Slag Entrapment

According to tundish prototype at steel work, the water model with linear scale ratio 1:3 of model and prototype has been established.Fluid flow behavior and entrapment phenomenon at the interface between slag and metal in tundish with gas curtain were studied by water model, the effect of gas flow rate and the distance of gas travel in fluid on slag/metal interface was surveyed.In normal moulding conditions, to avoid slag entrapment, the critical gas flow rate is 0.14 m³/h, and to avoid slag blow hole, the critical gas flow rate is 0.10~0.12 m³/h, if it exceeds the critical gas flow, the slag blow hole will expand at larger speed.