Modeling of Fluid Flow and Residence Time Distribution in a Four-strand Tundish for Enhancing Inclusion Removal

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概要

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• The introduction of the appropriate size and precise location of flow control devices such as dam, turbulence inhibitor, etc., helps to modify the flow pattern and minimizing short circuiting and dead zone. Beside this, these also create the surface directed flow and maximize the residence time available for the flotation of inclusions and assimilation of the reaction products from the molten steel into the slag phase. These can be products of deoxidation, reoxidation, precipitation, emulsification and/or entrainment of refractory components into the melt and thus encompass both indigenous and exogenous inclusions. To this end, both the numerical and physical simulations were carried out mainly for three cases: a) in absence of flow control devices (i.e., bare tundish), b) in the presence of a dam, and c) with the application of turbulence inhibiting device (TID) and dam combination in the existing tundish configuration. The commercial CFD (computational fluid dynamics) package FLUENT® was used to predict the flow field prevalent in the water model tundish at steady state, whereas in the experimental program, both Particle Image Velocimetry (PIV) techniques for flow measurements and tracer dispersion experiments for concentration measurements were applied in the present study. Among all types of configurations applied in the present study, a combination of TID with holes+a dam work reasonably found to be an optimum configuration of the four-strand tundish regarding inclusion floatation. A superior strand similarity is also achieved in this configuration. Also the predicted time averaged horizontal and vertical components agreed within ±10% with the experimentally derived ones.

• 社団法人 日本鉄鋼協会の論文
• 2008-01-15

著者

• Kumar A

  Steelmaking And Casting Res. Group Res. And Dev. Div. Tata Steel

• Mazumdar Dipak

  Department of Materials Science and Engineering, Indian Institute of Technology

• Mazumdar D

  Indian Inst. Of Technol. Kanpur Ind

• Mazumdar Dipak

  Department Of Materials & Metallurgical Engineering Indian Institute Of Technology

• KORIA Satish

  Department of Materials & Metallurgical Engineering, Indian Institute of technology

• Koria S

  Department Of Materials And Metallurgical Engineering Indian Institute Of Technology

• KUMAR Anil

  Steelmaking and Casting Research Group, Research and Development Division, Tata Steel

関連論文

• Mixing Models for Slag Covered, Argon Stirred Ladles
• An Assessment of Fluid Flow Modelling and Residence Time Distribution Phenomena in Steelmaking Tundish Systems
• Transient Flow and Mixing in Steelmaking Ladles during the Initial Period of Gas Stirring
• Modeling of Fluid Flow and Residence Time Distribution in a Four-strand Tundish for Enhancing Inclusion Removal
• Basis for Systematic Hydrodynamic Analysis of a Multi-strand Tundish
• A Comparative Study of Mixing Phenomena in Gas Stirred Ladle Systems
• Mathematical Modeling and Validation of Wall Shear Stress in Gas Stirred Vessels
• Mixing Models for Slag Covered, Argon Stirred Ladles
• Modeling of Slag Eye Area in Argon Stirred Ladles
• Impact of Ladle Design on Bath Mixing
• The Physical and Mathematical Modelling of Continuous Casting Tundish Systems
• DImensional Analysis and Mixing Phenomena in Bubble Stirred Ladles
• The Physical and Mathematical Modelling of Gas Stirred Ladle Systems.
• Comparison of Several Numerical Prediction Methods for Thermal Fields during Phase Transformation of Plain Carbon Steels.
• Experimental investigations on the design of gas injecting lances.

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