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01-12-2008 | Issue 6/2008

Metallurgical and Materials Transactions B 6/2008

Transient Mold Fluid Flow with Well- and Mountain-Bottom Nozzles in Continuous Casting of Steel

Journal:
Metallurgical and Materials Transactions B > Issue 6/2008
Authors:
R. Chaudhary, Go-Gi Lee, B.G. Thomas, Seon-Hyo Kim
Important notes
Manuscript submitted July 17, 2008.

Abstract

Nozzle shape plays a key role in determining the flow pattern in the mold of the continuous- casting process under both steady-state and transient conditions. This work applies computational models and experiments with a one-third scale water model to characterize flow in the nozzle and mold to evaluate well-bottom and mountain-bottom nozzle performance. Velocities predicted with the three-dimensional k-ε turbulence model agree with both particle- image velocimetry and impeller measurements in the water model. The steady-state jet velocity and angle leaving the ports is similar for the two nozzle-bottom designs. However, the results show that nozzles with a mountain-shaped bottom are more susceptible to problems from asymmetric flow, low-frequency surface-flow variations, and excessive surface velocities. The same benefits of the well-bottom nozzle are predicted for flow in the steel caster.

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