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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 17a
SUMMARY:Numerical investigation of non-metallic inclusion removal at the steel-slag interface
DESCRIPTION:Inclusion removal via slag absorption is considered a common way of lowering the inclusion amount in steel melt. However, the stage of inclusion separation at the steel-slag interface and further integration into the slag has been overlooked, leading to an overestimated inclusion removal efficiency. The current work conducts numerical simulations to investigate the interactions between a micron-sized spherical particle and steel-slag interfaces. By using the volume of fluid (VOF) method in combination with the dynamic overset mesh, this study is able to visualize the separation process, including the formation and evolution of a meniscus due to the wetting property of the system and the resulting capillary force-driven particle motion. The results indicate that the wetting angle and slag viscosity govern the interfacial separation. The role of capillary force is closely associated with the meniscus shape. It mainly acts as a driving force for particle motion arising from a decurved meniscus attached to the particle. It also imposes resistance when the meniscus is upcurved in the later stage of particle separation. In a low-viscosity environment, the positive capillary force results in significant particle acceleration and high enough particle displacement, thus separating the particle into the upper fluid. Whereas with the resistance from high viscous slag, no complete separation is observed, which corresponds to most situations in realistic steel-slag systems. It concludes that the dissolution of the particle happens near the steel-slag interface. Further, the effect of the dissolution-induced dynamic interfacial phenomenon, i.e., the Marangoni convection, is discussed. This study provides insight into the physics of inclusion removal at the interface which is essential for steel quality control.
CLASS:PUBLIC
DTSTART:20230614T094000
DTEND:20230614T100000
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