Abstract: In this paper, the velocimetric rod deflection method was used to measure the velocities near the mold surface, and the calculated results from mathematical model were compared and verified by the measured results. The flow fields in the mold with square nozzle, rectangular nozzle and runway-shape nozzle at different casting speeds and nozzle submerged depths were analyzed by the mathematical model. The results show that with three different submerged entry nozzles(SEN), the velocities near the mold surface increase as the casting speeds are increased, and decrease as the SEN submerged depths are increased. Under the same continuous casting process parameters, the velocities of the mold surface with the square nozzle is greater than those with the rectangular nozzle and the runway-shape nozzle.The velocities near the mold surface with the rectangle nozzle is comparable to those with the runway-shape nozzle. With three different submerged entry nozzles, the surface turbulent kinetic energy increase as the casting speeds are increased, and decrease as the SEN submerged depths are increased. Under the same continuous casting process parameters, the surface turbulent kinetic energy with the runway-shaped nozzle is minimal.

Key words: mold, fluid flow, turbulent kinetic energy, surface velocity, automobile exposed panel