Fluid Flow and Free Surface Phenomena in Rotary Electromagnetic Stirring of a Metallic Melt.

Partinen, J.; Szekely, J.; Vivès, C.; Holappa, Lauri

doi:10.2355/isijinternational.35.292

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…[3,7,8,17,[34][35][36] However, the attainment of an optimal microstructure requires a precise and comprehensive knowledge of the flow structure in the vicinity of the solidification front. In particular, beneficial effects like a distinct grain refinement or the promotion of a transition from a columnar to an equiaxed dendritic growth have been achieved; however, melt convection might also produce macrosegregation effects especially in solute-rich alloys showing different equilibrium concentrations of solute in the mixed crystal and the surrounding melt.…”

Section: Discussionmentioning

confidence: 99%

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Zhang

Shatrov

Priede

et al. 2011

Metall Mater Trans B

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The focus of the experimental and numerical study presented in this article is on the bulk flow within a swirling liquid metal column driven by a rotating magnetic field (RMF), whereas the free surface of the melt was covered by a distinct oxide layer. Flow measurements revealed an anomalous behavior of the flow: Pronounced oscillations of both the primary swirling and the secondary recirculating flow occur spontaneously. This peculiarity can be attributed to the influence of the oxide layer at the surface of the metal. The motion of the covering layer is governed by the strength of the fluid flow and the properties of the layer, and it might exhibit three different states of motion: permanent rotation, intermittent rotation, or the quiescent state. The regime of an intermittent oxide layer rotation reveals a striking influence on the bulk flow of the liquid metal. The amplitude of the velocity oscillations observed seems to be at least one order of magnitude larger than those of turbulent fluctuations in a steady RMF-driven flow. The essential features of the phenomenon observed were reproduced by a simple numerical model.

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Section: Discussionmentioning

confidence: 99%

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Zhang

Shatrov

Priede

et al. 2011

Metall Mater Trans B

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“…Например, в случае цилиндрической геометрии азимутальное перемешивание расплава приводит к однородному распределению вводимых добавок, а также ломке дендритов на фронте кристаллизации расплава. Возбуждение меридиональных течений улучшает перемешивание вводимых компонентов и влияет на форму границы «расплав -твердая фаза» [2][3][4][5][6].…”

Section: Introductionunclassified

Analysis of the Form and Evolution of the Solid Phase During Directional Crystallization of Non-Ferrous Metals With Electromagnetic Influence by Ultrasonic and Temperature Methods

Losev¹,

Mamykin²

2022

PNRPU Mechanics Bulletin

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The paper is devoted to the experimental study of new mechanisms of controlling the process of directional crystallization of non-ferrous metals. The focus of the study is on the development and testing of measuring techniques applicable both to laboratory modeling and to processes under real operating conditions. The mechanism of controlling the rate and homogeneity of crystallization of a metal melt by changing the phase angles between the supply currents of a traveling magnetic field induction stirrer is proposed. This makes it possible to generate vortex flows of various topologies in the liquid metal, in particular, to change the number of large-scale vortices or to suppress the large-scale flow. It is shown that the hydrodynamic flows have an impact on the crystallization front shape, which allows one to control the homogeneity of metal solidification by changing the characteristics of the power supply of the inductor. It is important to note that a change in the phase angles of the currents while maintaining the supply amplitude does not significantly affect the crystallization rate, which opens up wide possibilities for controlling processes by changing both the current strength and the phase angles. The temperature method for determining the position of the crystallization front was successfully applied and verified by ultrasonic velocimetry measurements. It has been found that, in the presence of developed flows in a liquid medium, thermocouple measurements provide good agreement (up to a few percent) of the measured position and geometric shape of the crystallization front with the ultrasonic measurement data. In the absence of liquid phase stirring, the difference between the thermocouple and ultrasonic measurements increases slightly. Nevertheless, even in this case, the thermocouple method can be used to correctly determine the position and velocity of the crystallization front.

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“…The flow and heat transfer in the continuous casting process are considerably complex so that it is impossible to study these issues by field tests because of a lack of the effective detecting methods. Moreover, experimental researches are expensive, time-consuming, and difficult to simulate the solidification process [2][3][4]. Numerical simulation was widely used to study and optimize the process [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow and solidification in continuous casting process with mold electromagnetic stirring

Yang

Deng

et al. 2018

J. Iron Steel Res. Int.

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The magnetic, heat transfer and flow phenomenon occurring in the continuous casting process under the mold electromagnetic stirring was further analyzed by solving the 3-D electromagnetic field mathematical model and flow solidification model with finite element method and finite volume method, respectively. The results indicate that the solidified shell thickness located in the effective stirring region fluctuates because of the unsteady scouring under the mold electromagnetic stirring. The maximum rotational velocity is a key parameter to the solidification of the billet when controlling the stirring intensity. When the rotational velocity reaches 0.32 m/s, the mush zone enlarges significantly and the solidification rate is further accelerated. The number of vortexes in the lower recirculation zone is not only two and depends on the stirring parameters. Besides, the secondary flow is closely associated with the solidification. Compared with the results of the model ignoring the influence of solidification on the flow of molten steel, the flow pattern within the lower recirculation region changes dramatically, and thus a coupling analysis of the flow, heat transfer, and solidification is essential when simulating the electromagnetic continuous casting process.

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Fluid Flow and Free Surface Phenomena in Rotary Electromagnetic Stirring of a Metallic Melt.

Cited by 8 publications

References 1 publication

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Analysis of the Form and Evolution of the Solid Phase During Directional Crystallization of Non-Ferrous Metals With Electromagnetic Influence by Ultrasonic and Temperature Methods

Numerical simulation of flow and solidification in continuous casting process with mold electromagnetic stirring

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