Title

SHELL GROWTH DYNAMICS IN A CURVED SLAB MOLD AFFECTED BY FLUID FLOW, HEAT TRANSFER AND FLUX INFILTRATION

SHELL GROWTH DYNAMICS IN A CURVED SLAB MOLD AFFECTED BY FLUID FLOW, HEAT TRANSFER AND FLUX INFILTRATION

Authorship

Garcia-Hernandez, S.; Barreto, J. de J.; J., R. D. Morales; Ramos-Banderas, A.

Garcia-Hernandez, S.

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Barreto, J. de J.

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J., R. D. Morales

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Ramos-Banderas, A.

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DOI

10.5151/2594-5300-16819

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Abstract

The objective of the present work is to study the effects of the submerged entry nozzle design, steel flow patterns, mold powder infiltration and heat transfer in a curved slab mold on the shell growth dynamics by mathematical simulation. The developed numerical model is based on the solution of the Navier-Stokes equations for incompressible viscous flow, together with the turbulence k-ε model and the Volume of Fluid (VOF) model to solve the multiphase system steel-slag-air. A theoretical approach is used for the heat transfer profiles along the mould walls. The results show that the buoyancy forces have a considerable braking effect on the liquid steel jet velocities and consequently in the flow patterns inside the mold. The mold curvature induces fluid flow patterns variations that have an important influence on the shell growth. And an inappropriate SEN port design has as a consequence that the port is not totally filled by the delivered liquid steel, promoting the formation of a back-flow at the upper edge of the port and also the formation of non- symmetrical oscillating jets. Even when the mold oscillation is not considered, the flux infiltration patterns were homogeneous along the mold and under the simulation conditions did not show to be a variable that affected the shell growth and solidified shell thickness.

The objective of the present work is to study the effects of the submerged entry nozzle design, steel flow patterns, mold powder infiltration and heat transfer in a curved slab mold on the shell growth dynamics by mathematical simulation. The developed numerical model is based on the solution of the Navier-Stokes equations for incompressible viscous flow, together with the turbulence k-ε model and the Volume of Fluid (VOF) model to solve the multiphase system steel-slag-air. A theoretical approach is used for the heat transfer profiles along the mould walls. The results show that the buoyancy forces have a considerable braking effect on the liquid steel jet velocities and consequently in the flow patterns inside the mold. The mold curvature induces fluid flow patterns variations that have an important influence on the shell growth. And an inappropriate SEN port design has as a consequence that the port is not totally filled by the delivered liquid steel, promoting the formation of a back-flow at the upper edge of the port and also the formation of non- symmetrical oscillating jets. Even when the mold oscillation is not considered, the flux infiltration patterns were homogeneous along the mold and under the simulation conditions did not show to be a variable that affected the shell growth and solidified shell thickness.

Keywords

Shell growth dynamics; Steel flow patterns; Mold powder infiltration; Heat transfer; Mathematical simulation.

Shell growth dynamics; Steel flow patterns; Mold powder infiltration; Heat transfer; Mathematical simulation.