Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

Yang, Jie; Cai, Zhuhua; Zhu, Miaoyong

doi:10.2355/isijinternational.isijint-2017-445

Cited by 28 publications

(9 citation statements)

References 42 publications

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“…At the casting speed of 0.3 m/min, the flat meniscus creates a flux channel with low level, where the high pressure zone is broad. According to the previous results 18) and Matsushita's observations, 23) the meniscus profile tends to bulge up with the increasing casting speed, which generates the narrower high pressure zone. Meanwhile, the peak value of these pressures continues to increase due to the narrower flux gap.…”

Section: Oscillation Behaviorsmentioning

confidence: 66%

“…The effect of solidification on turbulence is taken into account by adding a sink term to the turbulent kinetic energy and turbulent energy dissipation rate equations. 18) These coupled behaviors are solved simultaneously on the basis of industrial operating procedure using ANSYS FLUENT 14.0.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Full details of the model development were introduced in previous article. 18) A typical model prediction of slag films and solid shell, together with the local computational mesh are shown in Fig. 3 for a casting speed of 1.2 m/min.…”

Section: Model Descriptionmentioning

confidence: 99%

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Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

2018

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A computational model of the continuous casting process has been developed, which includes transient heat transfer, multiphase flow, solidification, and mold oscillation. Succeeding the previous report on the evolution phenomena in the mold, this article describes fluctuations in the pressure, heat flux, and slag films during the oscillation cycle and the coupling effect of these variables on slag flow and shell growth. The results show that the predicted flux pressure is decided by the combined effect of mold velocity and liquid film thickness. The presence of slag rim enhances the nonuniform pressure flow near the meniscus during mold oscillation. Increases in pressure and heat flux occur in the negative strip time while the mold and slag rim move downwards approaching the lowest position, which squeezes the slag flow to be divided into two tributaries, promoting the slag infiltration and the initial shell solidification. Negative consumption rate is identified partly in the cycle based on the velocity distributions of liquid slag. The model provides quantitative analysis regarding the influence of meniscus shape and slag films related to the casting speed on slag consumption and oscillation mark formation.

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Section: Oscillation Behaviorsmentioning

confidence: 66%

Section: Model Descriptionmentioning

confidence: 99%

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Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

2018

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“…Recent work has extended this model to include shell solidification and using a very refined grid were able to predict solidified hook formation, 110,111) oscillation-mark formation under various conditions 112) and evolution of solidification at the meniscus from cast-start to steady state. 113)…”

Section: Volume Of Fluid (Vof) Modelmentioning

confidence: 99%

Mathematical Modeling of Multiphase Flow in Steel Continuous Casting

2019

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This paper reviews multiphase flow models for continuous casting of steel from classical models to recent methods. These multiphase flow models are classified into six groups in this paper: quasi-multiphase models, multi-fluid models, moving grid methods, interface tracking methods, particle based models/ methods and hybrid models. For each model, the governing equations are summarized and the inherent advantages and disadvantages are discussed. Example applications of each model are presented from previous literature, illustrating typical results and accuracy that can be obtained. The objective of this paper is to guide readers to choose an appropriate multiphase flow model for their application. Argon gas bubble effects on the flow pattern can be modeled with simple mixture models, Eulerian-Eulerian models, Multiple size group models which also track bubble size distributions, and Discrete-Phase Models (DPM). Gas pockets and slug flow, which can occur inside the nozzle are more complex, and hybrid models which combine different models together, such as Eulerian-Eulerian, level-set, Volume of Fluid (VOF), and DPM, appear promising. The shape of the slag/steel interfacial profile, level fluctuations, and slag entrainment can be modeled with free surface methods, such as moving grid, VOF, or other interface tracking methods. Particle transport and entrapment, including inclusions and gas bubbles can be added via DPM models and also require a capture criterion model. Solidification and meniscus phenomena require flow models coupled with heat transfer and solidification.

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“…In our previous work, a numerical model that addresses the limitations of concurrent phenomena in the continuous casting mold, including fluid flow, heat transfer, shell solidification and mold oscillation, was developed [13,14]. The model was successfully used to characterize the slag infiltration phenomena and initial shell solidification during the casting process from cast-start to steady-state.…”

Section: Introductionmentioning

confidence: 99%

An Approach for Modelling Slag Infiltration and Heat Transfer in Continuous Casting Mold for High Mn–High Al Steel

Yang

Chen

Long

et al. 2019

Metals

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To clarify the characteristics of slag infiltration and heat transfer behaviors in the meniscus region during the casting of high Mn–high Al steel, a mathematical model of a continuous casting mold that couples fluid flow with heat transfer, and solidification is developed. The model is based on the change in slag composition and properties caused by the steel/slag reaction. The formation and evolution of the meniscus profile and slag films for different mold fluxes during mold oscillation are described. The results show that the rapid growth of the slag rim with a high Al2O3 content approaches and deforms the meniscus so that a series of casting problems such as slag infiltration blocking, large fluctuations in heat flux, and even meniscus breaking occur in the continuous casting process. Predictions are in good agreement with plant measurements. These findings provide an improved understanding of the complex phenomena occurring in the meniscus region and give new insights into the evaluation and optimization of mold flux properties for high Mn–high Al steel casting.

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Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

Cited by 28 publications

References 42 publications

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

Mathematical Modeling of Multiphase Flow in Steel Continuous Casting

An Approach for Modelling Slag Infiltration and Heat Transfer in Continuous Casting Mold for High Mn–High Al Steel

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