Journal ArticleDOI
Fluid flow and inclusion removal in continuous casting tundish
TLDR
In this paper, three modes of inclusion removal from molten steel in the tundish, i.e., flotation to the free surface, collision and coalescence of inclusions to form larger ones, and adhesion to the lining solid surfaces, are taken into account.Abstract:
Three-dimensional fluid flow in continuous casting tundishes with and without flow control devices is first studied. The results indicate that flow control devices are effective to control the strong stirring energy within the inlet zone, and other zones are with much uniform streamline. By dividing tundish into two zones with different inclusion removal mechanisms the inclusion removal is calculated. Three modes of inclusion removal from molten steel in the tundish, i.e., flotation to the free surface, collision and coalescence of inclusions to form larger ones, and adhesion to the lining solid surfaces, are taken into account. The Brownian collision, Stokes collision, and turbulent collision are examined and discussed. The suitable coagulation coefficient is discussed, and a value of 0.18 is derived. Calculation results indicate that, besides flotation, collision of inclusion and adhesion to the lining solid surfaces are also important ways for inclusion removal from molten steel in tundish especially for the smaller inclusions. The flotation removal holds 49.5 pct, and the adhesion removal holds 29.5 pct for the tundish with flow control devices; the collision effect is reflected in improving flotation and adhesion. Finally, industrial experiment data are used to verify the inclusion removal model.read more
Citations
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Journal ArticleDOI
State of the art in the control of inclusions during steel ingot casting
Lifeng Zhang,Brian G. Thomas +1 more
TL;DR: In this paper, the authors extensively review published research on inclusions in ingot steel and defects on ingot products, methods to measure and detect inclusions, the causes of exogenous inclusions and the transport and entrapment of inclusions during fluid flow, segregation, and solidification of steel cast in molds.
Journal ArticleDOI
Fundamentals of inclusion removal from liquid steel by bubble flotation
Lifeng Zhang,S. Taniguchi +1 more
TL;DR: In this paper, the authors apply results from the field of mineral processing to the liquid steel-inclusion-bubble system for the case of silica inclusions and argon bubbling.
Journal ArticleDOI
Physical and Mathematical Modelling of Steelmaking Tundish Operations: A Review of the Last Decade (1999–2009)
TL;DR: A review of the physical and mathematical modeling of tundish operation can be found in this paper, which summarizes the basics of physical modelling, mathematical modelling and the work of different researchers around the globe in the last decade i.e. 1999 to 2009.
Journal ArticleDOI
Nucleation, Growth, Transport, and Entrapment of Inclusions During Steel Casting
TL;DR: The nucleation, growth, transport, and entrapment of nonmetallic inclusions during the steel casting process are briefly reviewed in this article, where the current main research accomplishments as well as future topics that should be focused on in this field are summarized.
Journal ArticleDOI
Numerical Simulations of Inclusion Behavior in Gas-Stirred Ladles
Wentao Lou,Miaoyong Zhu +1 more
TL;DR: In this article, a computation fluid dynamics-population balance model (CFD-PBM) coupled model has been proposed to investigate the bubbly plume flow and inclusion behavior including growth, size distribution, and removal in gas-stirred ladles, and some new and important phenomena and mechanisms were presented.
References
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R. Jullien,M. Kolb,R. Botet +2 more
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TL;DR: In this paper, the coagulation of colloidal particles in a simple shear flow of a viscous fluid is considered, and a kinetic equation is proposed in which the hydrodynamic interaction between particles is taken into account.
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Criteria for Water Modeling of Melt Flow and Inclusion Removal in Continuous Casting Tundishes
Yogeshwar Sahai,Toshihiko Emi +1 more
TL;DR: In this paper, a procedure and appropriate criteria for water modeling of flow and inclusion flotation and removal are outlined, and the choice of model inclusion to water density and the model inclusion size needed for proper simulation of a given inclusion size in molten steel are discussed.