Abstract
Multiphase flows are frequently encountered in metallurgical operations. One of the most effective ways to understand these processes is by flow modeling. The process of tundish open eye (TOE) formation involves three-phase interaction between liquid steel, slag, and argon gas. The two-phase interaction involving argon gas bubbles and liquid steel can be modeled relatively easily using the discrete phase modeling technique. However, the effect of an upper slag layer cannot be captured using this approach. The presence of an upper buoyant phase can have a major effect on the behavior of TOEs. Hence, a multiphase model, including three phases, viz. liquid steel, slag, and argon gas, in a two-strand slab caster tundish, was developed to study the formation and evolution of TOEs. The volume of fluid model was used to track the interphase between liquid steel and slag phases, while the discrete phase model was used to trace the movement of the argon gas bubbles in liquid steel. The variation in the TOE areas with different amounts of aspirated argon gas was examined in the presence of an overlying slag phase. The mathematical model predictions were compared against steel plant measurements.
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Abbreviations
- α q :
-
Volume fraction of the qth fluid in a cell
- ρ q :
-
Density of the qth fluid in a cell, kg/m3
- S αq :
-
Source term indicating any nondiffusive or nonconvective term
- \( \overrightarrow {{\mathop v\nolimits_{q} }} \) :
-
Velocity of the qth fluid in a cell, m/s
- A TOE :
-
TOE area, m2
- Q :
-
Argon gas flow rate, SLPM
- Q c :
-
Critical argon gas flow rate, SLPM
- TPM:
-
Tons per minute
- SLPM:
-
Standard liters per minute (under STP)
- DPM:
-
Discrete phase modeling
- TOE:
-
Tundish open eye
- STP:
-
Standard temperature and pressure
- SEN:
-
Submerged entry nozzle
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Acknowledgments
The authors thank ArcelorMittal Global R&D Hamilton and ArcelorMittal Dofasco for the support provided in this study.
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Manuscript submitted March 15, 2017.
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Chatterjee, S., Li, D. & Chattopadhyay, K. Modeling of Liquid Steel/Slag/Argon Gas Multiphase Flow During Tundish Open Eye Formation in a Two-Strand Tundish. Metall Mater Trans B 49, 756–766 (2018). https://doi.org/10.1007/s11663-018-1177-z
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DOI: https://doi.org/10.1007/s11663-018-1177-z