Abstract
The horizontal and vertical velocity components of molten steel in a slab continuous casting mold produced by three different two-port Submerged Entry Nozzle (SEN) designs are monitored and compared using Computational Fluid Dynamics (CFD) simulations. These two ports designs correspond to a conventional cylindrical SEN, a plate SEN and an anchor-shaped SEN. Four monitoring points at the molten steel in the centered vertical plane were selected to track the horizontal and the vertical component of the velocity vector. Two of them are located near the free surface and the remaining two are located in the vicinity of the SEN discharge nozzles. Some statistical values of the time series of above the velocity components are analyzed and correlated with the Kelvin-Helmholtz instability and the Karman vortex streets, which cause mold powder entrapment in the molten steel.
Highlights
In the continuous casting of steel, molten steel is fed from a ladle into a mold through a Submerged Entry Nozzle (SEN)
The horizontal and vertical velocity components of molten steel in a slab continuous casting mold produced by three different two-port Submerged Entry Nozzle (SEN) designs are monitored and compared using Computational Fluid Dynamics (CFD) simulations
The X and Z components of the vector velocity of molten steel are associated with the magnitude of the Kelvin-Helmholtz instability and the Karman vortex streets, respectively
Summary
In the continuous casting of steel, molten steel is fed from a ladle into a mold through a Submerged Entry Nozzle (SEN). It is widely accepted that the quality of the continuous-cast products is severely affected by the fluid flow in the mold and the SEN design, and that sudden transients are responsible of flow instabilities that cause surface turbulence [1]. A Computational Fluid Dynamics (CFD) study on mold powder entrapment caused by vortexing flow at the interface between mold powder and molten steel near the SEN is reported in [3]. In this work the horizontal and vertical velocity components of molten steelproduced by three different SEN designs are monitored and compared using CFD simulations. These SEN have been previously characterized by the present authors in terms of free surface topography, velocity vector and turbulent intensity [9]. The vertical component of the velocity vector: Two of them near the free surface and the remaining two in the vicinity of the SEN discharge nozzles
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