Toward Modeling of Electrochemical Reactions during Electroslag Remelting (ESR) Process

Karimi-Sibaki, Ebrahim; Kharicha, Abdellah; Wu, Menghuai; Ludwig, Andreas; Boháček, Jan

doi:10.1002/srin.201700011

Cited by 16 publications

(19 citation statements)

References 21 publications

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“…The model enabled us to calculate vital parameters of the electrochemical system including activation and concentrated overpotential. We successfully managed to validate our model against experiments [17]. In the present study, we extended the model considering a 2D axisymmetric domain involving two iron electrodes with different sizes, separated by a CaF 2 -FeO electrolyte.…”

Section: Mathematical Modelmentioning

confidence: 96%

“…Recently, we developed a one-dimensional model including two planar, parallel electrodes which were separated by a completely dissociated CaF 2 -FeO electrolyte subjected to a DC electric field [17]. The model enabled us to calculate vital parameters of the electrochemical system including activation and concentrated overpotential.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…All governing equations, pertaining to boundary conditions and system parameters for the two mathematical modeling approaches, Ohmic and ionic, are listed in Table 1. They are described in detail elsewhere [17].…”

Section: Model Description/assumptionsmentioning

confidence: 99%

“…It is both logical and effective to formulate the PNP equations together with their boundary conditions in the dimensionless form [17,[24][25][26]. Subsequently, the Poisson equation (Table 1) in the dimensionless form is expressed as…”

Section: Model Description/assumptionsmentioning

confidence: 99%

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Confrontation of the Ohmic approach with the ionic transport approach for modeling the electrical behavior of an electrolyte

Karimi-Sibaki

Kharicha

et al. 2018

Ionics

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Two mathematical approaches have been compared for modeling the electrical behavior (e.g., electric/current density field) of an electrolyte. The first approach uses the traditional Ohmic method (Laplace equation) based on the assumption of a uniform concentration of ions in the electrolyte. The second approach utilizes the ionic transport method that takes into account the effect of electrochemical transport/reaction of ions assuming a quasi-electro neutral bulk for the electrolyte. For the latter, the PoissonNernst-Planck (PNP) equations are employed to include impacts of the non-uniformity of the concentration of ions on the electrical pattern of the electrolyte. Demonstratively, a 2D case was studied. It comprises two unequally sized electrodes, which are separated by the electrolyte. Findings show that the electrical behavior of the electrolyte remains unchanged using an Ohmic approach, regardless of variations in operational parameters such as applied voltage and electrode polarity. In contrast, the electrical behavior in response to the operational parameters is found to be significantly influenced using the ionic transport approach. Therefore, Ohm's law is invalid in the bulk of an electrolyte, when a non-uniform concentration field of ions exists. Ultimately, the obtained results helped to propose an explanation on a commonly observed phenomenon (melt rate-polarity relationship) during the DC operation of the electroslag remelting (ESR) process.

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Section: Mathematical Modelmentioning

confidence: 96%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Model Description/assumptionsmentioning

confidence: 99%

Section: Model Description/assumptionsmentioning

confidence: 99%

See 2 more Smart Citations

Confrontation of the Ohmic approach with the ionic transport approach for modeling the electrical behavior of an electrolyte

Karimi-Sibaki

Kharicha

et al. 2018

Ionics

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“…As such, it is necessary to establish electrochemical models to study the electrical behavior of the slag. Karimi-Sibaki et al [137][138][139] solved the dimensionless Poisson-Nernst-Planck (PNP) equations to model electro-migration and diffusion of ions. Spatial variations of concentrations of ions, charge density, and electric potential across the electrolyte are analyzed.…”

Section: Non-metallic Inclusions (Nmi)mentioning

confidence: 99%

Review on Modeling and Simulation of Electroslag Remelting

Kharicha

Karimi-Sibaki

et al. 2017

steel research int.

Self Cite

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The Electroslag Remelting (ESR) is an advanced technology for the production of high quality materials, for example, hot work tool steels or nickel base alloys. In the past years, several models are developed aiming to predict the way in which the operational parameters affect the structure and chemical composition of the final ESR ingot. Proper modeling of this process depends on the ability of the model to predict the Multiphysics resulting from the complex coupling between many physical phenomena. This review includes the main findings starting from the 1970's, with a special focus on the results obtained in the period of 1999-2017. The difficulties related to the poorly known physical properties of ESR slags are discussed. Then, the main achievements in the field of electromagnetism, fluid flow, heat transfer, and solidification are also summarized. The review finishes by presenting the special topics representing the actual scientific frontiers, such as the physics of mold current, the importance of multiphase phenomena, and the difficulties in predicting the electrode melting rate.

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Numerical Study on the Effect of Low‐Frequency Power Supply on Desulfurization in the Electroslag Remelting Process

Duan

Liu

et al. 2023

steel research int.

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In the electroslag remelting (ESR) process, low‐frequency power supply can significantly reduce power consumption and achieve three‐phase balance of power supply. Therefore, a transient coupling model of fluid flow, heat transfer, and component transport in the ESR process, which is coupled to the electromagnetic field calculated using Maxwell 3D software, is established to study the influence of low‐frequency power supply on desulfurization. When a 50 Hz power supply is used, a skin effect is observed in the metal, and the direction of the Lorentz force at the slag/metal interface changes. However, this effect becomes less pronounced with decreasing current frequency. Sulfur is mainly transferred at the electrode tip, and the desulfurization rate is approximately 50%. Electrochemical reactions mainly occur at the electrode tip/slag interface and the metal pool/slag interface. The removal rate of sulfur using direct current (DC) power supply is less than that using an alternating current power supply. The DC reverse polarity power supply leads to higher desulfurization rate than DC straight polarity, which is 74% and 31%, respectively. The sulfur removal rate increases from 81.37% to 84.59% as the frequency decreases from 50 to 2 Hz because of the longer electrochemical reaction time at this lower frequency.

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Toward Modeling of Electrochemical Reactions during Electroslag Remelting (ESR) Process

Cited by 16 publications

References 21 publications

Confrontation of the Ohmic approach with the ionic transport approach for modeling the electrical behavior of an electrolyte

Confrontation of the Ohmic approach with the ionic transport approach for modeling the electrical behavior of an electrolyte

Review on Modeling and Simulation of Electroslag Remelting

Numerical Study on the Effect of Low‐Frequency Power Supply on Desulfurization in the Electroslag Remelting Process

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