Bubble behavior in the slab continuous casting mold: Physical and mathematical model

A two phase population balance is used to predict the polydispersed bubble flow and size distribution in a slab continuous casting mold and Submerged Entry Nozzle (SEN) system. Multiple Size Group (MUSIG) with a suitable breakage and coalescence model (Ansys CFX) was adopted to account for the polyd...

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Bibliographic Details
Published in:Journal of materials research and technology 2020-05, Vol.9 (3), p.4717-4726
Main Authors: Santos, Paulo Luiz, Peixoto, Johne Jesus Mol, Silva, Carlos Antônio da, Silva, Itavahn Alves da, Galinari, Clenice Moreira
Format: Article
Language:English
Subjects:
CFD
Continuous casting
Drag and non-drag forces
Mathematical modeling
Physical modeling
Upper nozzle refractory
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Summary:A two phase population balance is used to predict the polydispersed bubble flow and size distribution in a slab continuous casting mold and Submerged Entry Nozzle (SEN) system. Multiple Size Group (MUSIG) with a suitable breakage and coalescence model (Ansys CFX) was adopted to account for the polydispersed gas flow. Initial bubble size distribution as determined for two industrial refractories have been taken in consideration. A two way coupling model including the effect of the drag force and non-drag forces such as virtual mass force and turbulent dispersion force was considered. The results are compared with gas distribution in a 1:1 scale water — air mold model running under conditions of fluidynamic similarity to validate the model. The simulations have then been extended to describe the actual steel — argon flow, considering a thermal expansion factor for argon bubbles. The effect of gas distribution on the flow field of liquid inside the mold and other metallurgical aspects are discussed.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2020.02.099