Mathematical Model for Removal of Inclusion in Molten Steel by Injecting Gas at Ladle Shroud

Wang, Li Tao; Zhang, Qiao Ying; Deng, Chen Hong; Li, Zheng Bang

doi:10.2355/isijinternational.45.1138

Cited by 32 publications

(20 citation statements)

References 14 publications

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“…The model could also be used to predict the gas and liquid flow conditions at which the transition from bubbly to churn-turbulent flow occurs. Wang et al 6) developed a mathematical model for inclusion removal in molten steel by inert gas shrouding. They discussed the probabilities of collisions and subsequent adhesion of bubbles with inclusions, and pointed out that bubble adhesion is an important parameter for inclusion removal.…”

Section: Introductionmentioning

confidence: 99%

Physical and Mathematical Modelling of Inert Gas Shrouding in a Tundish

2011

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Inert gas shrouding practices in water model tundishes were mathematically simulated using the finite volume based program ANSYS 12. The fluid within the tundish and the ladle shroud was assumed to be Newtonian and incompressible (water), and the flow within the shroud was assumed to be predominantly bubbly i.e. discrete bubbles are formed, and these move down the shroud along with the down-flowing water. Thus, the numerical model was developed using the Discrete Phase Modeling (DPM) approach, along with the standard k-ε turbulence model with two way turbulence coupling. Predicted flow fields, slag behaviour and bubble trajectories were investigated and then compared with experiments in the full scale and one third scale water model tundishes. Various experimental measurements compared well with predictions from the mathematical model, which was shown to slightly over-estimate depths of penetration of the bubble column by 5-15%.

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Section: Introductionmentioning

confidence: 99%

Physical and Mathematical Modelling of Inert Gas Shrouding in a Tundish

2011

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“…Wang et al 16) suggested a model for inclusion removal efficiency by gas bubbling under assumptions as follows.…”

Section: Resultsmentioning

confidence: 99%

Effect of Gas Bubbling on Tensile Elongation of Gravity Mold Castings of Magnesium Alloy

Yim

You

2007

Mater. Trans.

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The effect of Ar gas bubbling on the tensile elongation of gravity mold castings of AZ91D magnesium alloy was evaluated qualitatively. The beneficial effect of gas bubbling on the tensile elongation of castings was resulted from the removal of inclusions in melt. The removal efficiency of inclusion by bubble floatation is dependent on processing variables including flow rate of gas, gas blowing time and melt temperature. Considering only the interaction between bubble and inclusion, the removal efficiency of inclusion will increase with increase in flow rate of gas, gas blowing time and melt temperature. But dissolution of gas into melt and entrance of new non-metallic particles formed on the melt surface deteriorated the tensile elongation of castings.

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“…According to Eqs. (14) and (15), the particle number density of the inflow is 38.4/ml. Thus, the RRI under different bubble conditions for a bare tundish are listed in Table 5.…”

Section: Particle Detection Of the Inlet Streammentioning

confidence: 99%

“…Some investigations [14][15][16] showed that the small inclusions which are non-wetted with the liquid can be brought to the top surface by attaching to gas bubbles, or by being captured within a rising bubble's wake. Besides, the upward flow caused by bubbles floating out of the bath, homogenizes liquid steel temperatures and composition.…”

Section: Removal Of Inclusions Using Micro-bubble Swarms In a Fourstrmentioning

confidence: 99%

Removal of Inclusions Using Micro-bubble Swarms in a Four-strand, Full-scale, Water Model Tundish

et al. 2016

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Water model experiments were performed in a full-scale, delta-shaped water model tundish, in order to study the removal of inclusions by micro-bubbles. Micro-bubbles were generated using a specially designed ladle shroud with twelve laser-drilled orifices. Gas flow rates, injection positions and multi-port injection were all taken into consideration to create different bubble conditions. Bubbles were recorded using a high speed camera and post-processed with commercial software, Image J. Hollow glass borosilicate microspheres, smaller than 100 μm, were used to simulate inclusions, and detected, in-situ, using a new generation of the Aqueous Particle Sensor, APS III. The results revealed that the effect of microbubbles on inclusion removal depends greatly on the gas injection protocols used. The optimum gas flow rate was an intermediate value, which indicates a minimum particle number density, n p , of about 7.85/ml. This results from the counter-balancing effects of bubble sizes against the total number of bubbles. The highest inclusion removal rate was 80%, when gas was injected through the four ports located closest to the slide gate, at a gas flow rate of 0.2 L/min.

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Mathematical Model for Removal of Inclusion in Molten Steel by Injecting Gas at Ladle Shroud

Cited by 32 publications

References 14 publications

Physical and Mathematical Modelling of Inert Gas Shrouding in a Tundish

Physical and Mathematical Modelling of Inert Gas Shrouding in a Tundish

Effect of Gas Bubbling on Tensile Elongation of Gravity Mold Castings of Magnesium Alloy

Removal of Inclusions Using Micro-bubble Swarms in a Four-strand, Full-scale, Water Model Tundish

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