Numerical Simulation of Mold Flux Entrapment in Slab CC Mold Under Double-Ruler EMBr Condition Assisted with High-Temperature Quantitative Velocity Measurement
摘要
In the current work, a mathematical model coupled with computational fluid dynamics and magneto hydro dynamics is implemented to investigate the optimization effect of double-ruler electromagnetic braking (EMBr) on the mold flux entrapment in slab continuous casting (CC) mold at a high casting speed of 2.0 m·min−1. The numerical simulation results all display excellent alignment with high-temperature measurements without and with EMBr. Without EMBr, the mold flux entrapment rate is up to 1.37 g·s−1, and the maximum diameter of these droplets is larger than 5 mm. Among them, the mass of mold flux droplets trapped by walls within 40 seconds is 5.66 g. Using double-ruler EMBr can lower the incidence of mold flux entrapment. With a lower coil current of 700 A, when the upper coil currents are 0, 250, and 450 A, the mold flux entrapment rates decrease to 0.12, 0.04, and 0.07 g·s−1, the masses of mold flux droplets trapped by walls within 40 seconds reduce to 0.53, 0.02, and 0.11 g, and the maximum diameters of these droplets decrease to 3.52, 1.05, and 2.08 mm, respectively.