Micro-bubble Formation under Non-wetting Conditions in a Full-scale Water Model of a Ladle Shroud/Tundish System

Chang, Sheng; Cao, Xiangkun Elvis; Zong-shu, Zou; Isac, Mihaiela; Guthrie, R. I. L.

doi:10.2355/isijinternational.isijint-2017-390

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…On symmetry plane, the boundary condition for velocity field is a zero normal component and zero gradient of tangential velocity component. (5) The wall of the tundish was modeled as a no-slip wall boundary condition; the region near the wall was treated with a standard wall function [28].…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The argon blowing patterns in the tundish mainly include the long shroud, the bottom permeable brick, the stopper, and the upper nozzle. Studies [5][6][7] of argon blowing through the long shroud demonstrated that the micro-bubbles generated by argon blowing could improve the removal rate of 2 of 16 inclusions in the tundish, but these micro-bubbles had a short residence time in the tundish. Thus, the effect of removing small inclusions is less obvious.…”

Section: Introductionmentioning

confidence: 99%

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A Simulation Study on the Flow Behavior of Liquid Steel in Tundish with Annular Argon Blowing in the Upper Nozzle

Qin

Cheng

et al. 2019

Metals

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A three-dimensional mathematical model of gasliquid two-phase flow has been established to study the flow behavior of liquid steel in the tundish. The effect of the argon flow rate and casting speed on the flow behavior of liquid steel, as well as the migration behavior of argon bubbles, was investigated. The results from the mathematical model were found to be consistent with those from the tundish water model. There were some swirl flows around the stopper when the annular argon blowing process was adopted; the flow of liquid steel near the liquid surface was active around the stopper. With increased argon flow rate, the vortex range and intensity around the stopper gradually increased, and the vertical flow velocity of the liquid steel in the vicinity of the stopper increased; the argon volume flow in the tundish and mold all increased. With increased casting speed, the vortex range and intensity around the stopper gradually decreased, the peak value of vertical flow velocity of liquid steel at the vicinity of the stopper decreased, and the distribution and ratio of argon volume flow between the tundish and the mold decreased. To avoid slag entrapment and purify the liquid steel, the argon flow rate should not be more than 3 L·min−1. These results provide a theoretical basis to optimize the parameters of the annular argon blowing at the upper nozzle and improve the slab quality.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simulation Study on the Flow Behavior of Liquid Steel in Tundish with Annular Argon Blowing in the Upper Nozzle

Qin

Cheng

et al. 2019

Metals

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show abstract

“…Researchers also focus on the improvement of steel cleanliness, mainly in the ladle, tundish and directly, in the slab casting operation. The common practice is the absorption of inclusions to the slag layer [2], intensification of the removal process by the additional inert gas injection [3][4][5], introduction of special channels with induction heating [6] or finally, dedicated control devices can be added to improve the stirring of the melt like baffle walls or electromagnetic stirrers (EMS) [7,8]. Currently, the research in this area mainly focuses on mathematical or numerical modelling due to the difficulties with the measurements under real production conditions.…”

Section: Introductionmentioning

confidence: 99%

Advanced CFD investigations of electromagnetic stirring of molten steel in continuous caster tundish

Zielińska

2023

Materials Research Proceedings

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Abstract. The continuous casting process is one of the initial operations in the entire metal forming chain used in the metallurgical industry. The phenomena of solidification and unification of properties that occur during slab casting are highly dependent on the steel composition and the purity of the metal. The high cleanliness of steel is the determinant of the good quality of the final products, without internal cracks or inhomogeneities in mechanical, thermal or electrical properties. Therefore, one of the production goals is to avoid the non-metallic inclusions in the molten steel by intensifying their removal processes. One of the most important metallurgy equipment responsible for cleaning the steel is the ladle furnace, where special mixing processes are executed to increase the removal process of unfavourable elements. Another critical piece of equipment is the tundish, located just before the slab casting, which can additionally improve the microstructure final composition and homogeneity. Therefore, the investigations presented in the paper are centred on the development of an advanced Computational Fluid Dynamic (CFD) model of the flow behaviour of the molten steel inside the tundish. The key element of the model is to include the effect of an additional electromagnetic stirring device which can improve the cleanliness and the composition of the steel and hence its final properties. The role of this device is often omitted during practical research, but its direct influence on the properties of the steel has a clear impact on the characteristics of the formed metallic parts under further processing operations. Therefore, optimization of the process inside the tundish is essential from an industrial point of view. The paper includes a detailed analysis of the flow and stirring energy distributions to predict and understand the active and dead zones inside the tundish to avoid the regions with stagnant velocity distribution. As an outcome of such a developed coupled electromagnetic/fluid dynamic model, optimizing the mixing processes to control the product's properties is possible.

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“…As mentioned, such process improvements can be achieved with additional devices, increasing mixing efficiency and reducing the risk of dead zone development. Devices such as baffle walls, dams, weirs, inert gas channels, [10][11][12] and channels with additional induction heating [13] can be used for this purpose. Recently, another more advanced group of solutions, including electromagnetic stirrers (EMS) [6,14,15] or electromagnetic brakes, was also proposed to improve steel quality and productivity effectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electromagnetic Field on Stirring Energy in Selected Metallurgical Equipment

Zielińska,

Yang,

Madej

et al. 2023

steel research int.

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This article analyzes the turbulence dissipation rate in liquid steel in selected metallurgical equipment (i.e., electric arc furnace, ladle furnace, and tundish) based on advanced computational fluid dynamics simulations. The approach enables evaluation of the efficiency of electromagnetic stirrer (EMS) devices based on the molten steel flow behavior in comparison with the standard mixing process. Particular attention is put on the determination of the effectiveness of novel EMS with the horizontal stirring device, which supports the mixing process of molten steel. For that, the concept of the new formula to evaluate the stirring energy is presented and compared with the literature results to prove the correctness of the developed method.

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Micro-bubble Formation under Non-wetting Conditions in a Full-scale Water Model of a Ladle Shroud/Tundish System

Cited by 7 publications

References 35 publications

A Simulation Study on the Flow Behavior of Liquid Steel in Tundish with Annular Argon Blowing in the Upper Nozzle

A Simulation Study on the Flow Behavior of Liquid Steel in Tundish with Annular Argon Blowing in the Upper Nozzle

Advanced CFD investigations of electromagnetic stirring of molten steel in continuous caster tundish

Influence of Electromagnetic Field on Stirring Energy in Selected Metallurgical Equipment

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