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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 19b
SUMMARY:Simulation of flow-induced inclusion deposition in a continuous casting strand
DESCRIPTION:In bow-type continuous slab casters, non metallic macro-inclusions (size 50 to 200 μm) are concentrated in a small band over the strand thickness, also called „quarter depth inclusion band“. This effect was observed in measurements and can be explained theoretically by the bow geometry in combination with the upwards drift velocity of inclusions in the liquid steel due to the density difference. Measurements also showed that the inclusion distribution is often significantly inhomogeneous and asymmetric over the strand width. Theoretical considerations explain this effect by an inhomogeneous flow pattern in the bending zone of the strand. In this contribution, transient numerical flow simulations of the liquid steel inside of the strand with the scale resolving SAS turbulence model in combination with non-metallic particle transport are presented. The time scales of the flow fluctuations in the bending zone showed to be quite large. Therefore, one hour of the casting process was simulated, which requires about one year of computation time. Two cases without and with argon gas injection at the stopper rod tip were considered. The injected gas is assumed to form bubbles, that are transported with the liquid steel flow into the mold and influence the mold flow by their buoyancy forces. The results show irregular fluctuations of the inclusion distribution with alternating asymmetric profiles over the strand width, with time scales in the order of magnitude of several minutes, corresponding to strand length distances of several meters. The case with argon injections shows slightly lower peak concentrations than the case without gas injection.
CLASS:PUBLIC
DTSTART:20230614T113000
DTEND:20230614T115000
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