Mathematical Modeling of Iron and Steel Making Processes. Swirling Flow Effect in Bottomless Immersion Nozzle on Bulk Flow in High Throughput Slab Continuous Casting Mold.

Abstract

Swirling flow effectiveness on controlling the bulk mold flow has been acknowledged recently, concerning the productivity and its quality of continuous casting process. In this study, simple immersion nozzle without opposite face on the end of the nozzle is proposed. From the practical viewpoint, relationship between the throughput and bulk mold flow is investigated. Following results are obtained: 1) Numerical analysis fairly coincide with the experimental results for the cases: nozzle outlet, surface flow and velocity distributions along the narrow face. 2) Surface velocity decreases with increasing the axial length of the nozzle outlet, particularly in length from 20 to 60 mm. 3) For the high throughput case, considerably stable bulk mold flow can be obtained. 4) Bulk mold flows under different throughputs are similar with each other if (tangential velocity W in nozzle/axial velocity Vz in nozzle) of those have same magnitude with each other.