Study of transient flow and particle transport in continuous steel caster molds: Part I. Fluid flow |
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Authors: | Quan Yuan Brian G Thomas S P Vanka |
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Affiliation: | (1) the Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 61801 Urbana, IL |
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Abstract: | Unsteady three-dimensional flow in the mold region of the liquid pool during continuous casting of steel slabs has been computed
using realistic geometries starting from the submerged inlet nozzle. Three large-eddy simulations (LES) have been validated
with measurements and used to compare results between full-pool and symmetric half-pool domains and between a full-scale water
model and actual behavior in a thin-slab steel caster. First, time-dependent turbulent flow in the submerged nozzle is computed.
The time-dependent velocities exiting the nozzle ports are then used as inlet conditions for the flow in the liquid pool.
Complex time-varying flow structures are observed in the simulation results, in spite of the nominally steady casting conditions.
Flow in the mold region is seen to switch between a “double-roll” recirculation zone and a complex flow pattern with multiple
vortices. The computed time-averaged flow pattern agrees well with measurements obtained by hot-wire anemometry and dye injection
in full-scale water models. Full-pool simulations show asymmetries between the left and right sides of the flow, especially
in the lower recirculation zone. These asymmetries, caused by interactions between two halves of the liquid pool, are not
present in the half-pool simulation. This work also quantifies differences between flow in the water model and the corresponding
steel caster. The top-surface liquid profile and fluctuations are predicted in both systems and agree favorably with measurements.
The flow field in the water model is predicted to differ from that in the steel caster in having higher upward velocities
in the lower-mold region and a more uniform top-surface liquid profile. A spectral analysis of the computed velocities shows
characteristics similar to previous measurements. The flow results presented here are later used (in Part II of this article)
to investigate the transport of inclusion particles. |
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