Study on fluid flow in a large round bloom continuous casting mold

The fluid flow in an 800 mm diameter bloom mold from two kinds of submerged entry nozzles (SEN) was investigated numerically with a mathematical model and experimentally in a water model. It was shown from the research results that the impacting depths measured in the water modeling experiments are in good agreement with the ones from the numerical calculation. The impacting depths obtained from the 4-port down 5 degrees SEN are 140 similar to 220 mm at immersion depths from 100 to 180 mm, while those from 5-port up 5 degrees SEN are 60 similar to 120 mm at immersion depths from 100 to 140 mm. There are an upper and a lower recirculating zone for these two SENs at the vertical section through a port center. Dimension of these two recirculating flow zones varies with the immersion depth of the SENs. At 100 mm immersion depth of the tow SENs the eye of the upper recirculating flow is not evident. The eyes of the upper recirculating flows for 5-port up 5 degrees SEN are close to the SEN, while the ones for 4-port down 5 degrees SEN are close to the mold wall. On the liquid surface in the mold, flow produced with the 4-port SEN creates 8 recirculating flow zones close to the SEN, while 10 recirculating flow zones close to the mold wall are formed with the 5-port SEN.