Modelling Study of Inclusions Removal by Bubble Flotation in the Tundish

Ramos-Banderas, A.; Morales, R. D.; Barreto, José de Jesús; Solorio-Díaz, Gildardo

doi:10.1002/srin.200606394

Cited by 32 publications

(37 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the turbulence model was kept as simple as possible without affecting the overall solution. The k-ε model has been proved to give acceptable results in previous works 19,20) and it is used here to save computing time. The fundamentals of Navier-Stokes and the k-ε equations of this model can be found in different sources.…”

Section: Fluid and Turbulence Modelmentioning

confidence: 96%

Numerical Simulation of Heat Transfer and Steel Shell Growth in a Curved Slab Mold

et al. 2013

View full text Add to dashboard Cite

The main aims of the present research is the study of steel flow under temperature gradient to understand the convective effects on the flow patterns inside the mold and its effects on the shell growth kinetics under more realistic conditions. In order to achieve this, a non-isothermal mathematical model is developed based on the Navier-Stokes equations together with the k-ε turbulence model, the volume of fluid model to solve the multiphase system air-slag-steel and a solidification model. Comparing isothermal and non-isothermal results, it is observed that the buoyancy forces are large enough to modify radically the lower recirculation flows inducing shorter and upwards streams; however, the upper recirculation flows do not show strong changes. Shell growth does not necessarily follow a steady parabolic growth and it is more dependent on the washing effects of convective steel streams. Therefore, shell thickness reports heterogeneous and irregular magnitudes through the four faces of the slab. In addition, mold curvature provides uneven shell growth in the inner side of the slab while in the outer side the shell thickness observes a more regular growth. Shell thickness is irregular and discontinuous all around the upper periphery of the slab; therefore, this region is very sensitive to cracking. Finally, the numerical results for liquid steel solidification are compared to published results of shell growth showing a very good qualitative agreement.

show abstract

Section: Fluid and Turbulence Modelmentioning

confidence: 96%

Numerical Simulation of Heat Transfer and Steel Shell Growth in a Curved Slab Mold

et al. 2013

View full text Add to dashboard Cite

show abstract

“…There are two different mechanisms reported in literature which improve the separation rate. At low gas flow rates, the bubbles positively influence the liquid flow field . The influence of bubble particle collisions is neglected.…”

Section: Introductionmentioning

confidence: 99%

“…The optimal amount of gas bubbles inserted in the tundish is still under discussion. Reported gas flow rates range from well below 0.01 l stp min −1 up to 55 l stp min −1 . While the low gas flow rates can be expected to barely change the global flow field in the tundish, larger gas flow rates can induce large flow velocities, which can even deflect the jet coming from the ladle shroud.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Influence of a Centered Line Sparger on the Jet from the Shroud in a 1:3 Water Model of a Tundish

Thumfart¹,

Pelss

Pfeifer

2019

steel research int.

View full text Add to dashboard Cite

In a continuous casting plant a tundish serves two main purposes. Firstly, it is a buffer vessel between the ladles and the mold and secondly, it is designed to remove non‐metallic particles from the melt. As the demands on the quality of the cast product have increased strongly, floatation (removal of particles using bubbles) of the particles becomes necessary. These bubbles alter the global flow field in the tundish. At large gas flow rates this influence needs to be considered in the positioning of mechanical flow control devices such as wears or impact pads. In this paper the influence of a line sparger on the global flow field is investigated using a 1:3 water model. A series of PIV (Particle Image Velocimetry) measurements have been performed at a wide range of air and water flow rates showing the influence of the bubbles on the shape of the liquid jet from the shroud. In addition, a dimensionless number is derived, which can be used to scale the gas flow rate from different experiments. This number is shown to be valid within the range of the experiments presented in this paper.

show abstract

“…It is only possible to limit supercritical and dimensionally critical NMIs occurring in steel, which adversely affect CSC and plastic working processes and, as a consequence, the functional properties of the finished products. This explains the special interest in NMIs and research undertaken in many research centers on the possibility of removing NMIs during steel production …”

Section: Introductionmentioning

confidence: 99%

“…Modeling studies, both physical and numerical (Computational Fluid Dynamics—CFD) are research methods that are commonly used for the investigation of the problems of removing NMIs from liquid steel. Both methods support and complement each other; therefore, they are often combined in a single research program . Such a combination is known as hybrid modeling.…”

Section: Introductionmentioning

confidence: 99%

Modeling Research Technique of Nonmetallic Inclusions Distribution in Liquid Steel during Its Flow through the Tundish Water Model

Merder

Warzecha

et al. 2019

steel research int.

View full text Add to dashboard Cite

This study shows research results of behaviors of nonmetallic inclusions (NMIs) in a tundish represented by water model. The object under investigation is a two‐strand trough‐type continuous casting tundish operating in one of the Polish steel plants. Hollow glass microspheres with diameters ranging from 10 to 140 μm are used for testing, which represents the NMIs. The distribution process of microspheres is investigated; the qualitative analysis (visualization) and quantitative analysis (using a laser particle counter) of microsphere distribution (movement) are performed. Based on the obtained results, it is found that the analyzed tundish is not of optimal design, in terms of removing small NMIs, as they are conducted in a stream of liquid flowing at the bottom of the tundish, moving directly into nozzles of the tundish. Their movement is caused by the shaped liquid‐flow phenomena in the tundish working space. The test results help to validate a numerical model, which can be used in further studies to redesign the working space of the tundish. The positive result of verification facilitates to obtain a tool for implementing flow optimization in terms of receiving high metallurgical purity of slabs.

show abstract

Modelling Study of Inclusions Removal by Bubble Flotation in the Tundish

Cited by 32 publications

References 5 publications

Numerical Simulation of Heat Transfer and Steel Shell Growth in a Curved Slab Mold

Numerical Simulation of Heat Transfer and Steel Shell Growth in a Curved Slab Mold

Experimental Investigation of the Influence of a Centered Line Sparger on the Jet from the Shroud in a 1:3 Water Model of a Tundish

Modeling Research Technique of Nonmetallic Inclusions Distribution in Liquid Steel during Its Flow through the Tundish Water Model

Contact Info

Product

Resources

About