In the present article, the performance and the efficiency of ceramic filters for continuous steel filtration in an induction crucible furnace, which is part of the steel casting simulator facility located at Technische Universität Bergakademie Freiberg, is investigated numerically. In order to achieve this objective, a macro-scale simulation for the melt flow in the crucible is coupled with a pore-scale simulation for the flow inside the ceramic filter that is adequately resolved by its detailed filter geometry, obtained from computed tomography scan images. The considerable influence of the filter on the flow field is indicated from the present results. Moreover, the efficiency of the employed filter is also determined and compared for two pore densities.

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A numerical model based on the assumption that carbon monoxide bubbles form due to reaction between carbon and oxygen on the rough surface of inclusions is introduced to investigate the effects on inclusion removal. The proposed numerical model can be used to determine the growth of such carbon monoxide bubbles on an inclusion, which increases the rising velocity of the inclusion to reach the free surface of the melt faster. The results confirm that formation of carbon monoxide bubbles on the surface of inclusions can considerably increase the number of inclusions removed and thereby improve the cleanliness of steel melt.

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