Comparison of Standard k-ε Model and RSM on Three Dimensional Turbulent Flow in the SEN of Slab Continuous Caster Controlled by Slide Gate

概要

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The fluid flow in the SEN and its outflow characteristic at nozzle port, after installation of slide gate system to control molten steel flow rate, have been investigated by mathematical simulation using standard k-ε model, RSM and experimental measurement by Ultrasonic Doppler Velocimeter (UDV) respectively, and the adaptability of turbulence models has been discussed. The research results indicate that, due to the throttle action of slide gate, a secondary flow and a separated flow are generated under the slide gate, and a swirl flow appears at nozzle port, with the swirl direction from the clogging side via nozzle bottom to the opening side of the slide gate. The swirl direction of outflow at nozzle port calculated by standard k-ε model is contrary to the measurement result by UDV and, the calculated result obtained by RSM is close to the UDV data. Based on kinetic theory of molecular, theoretical deficiencies of the Boussinesq hypothesis has been discussed.