Reformulation of time averaged Joule heating in presence of temperature fluctuations

Kharicha, Abdellah; Schützenhöfer, Wolfgang; Ludwig, Andreas; Tanzer, Robert; Wu, Menghuai

doi:10.1179/136404609x367579

Cited by 16 publications

(19 citation statements)

References 5 publications

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“…The interfaces between the three different phases (metal, slag, gas) are tracked with a Volume of Fluid (VOF) method. 11,12) A single set of momentum equations is shared by the fluids, and the volume fraction of each fluid in each computational cell is tracked throughout the domain. According to the local value of the volume fraction f, appropriate properties and variables are assigned to each control volume within the domain.…”

Section: Two Dimensional Model Description For Esr Process Simulationmentioning

confidence: 99%

On Melting of Electrodes during Electro-Slag Remelting

Kharicha

Ludwig

2014

ISIJ Int.

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In this paper a numerical investigations on the thermal state and on the tip shape of a melting electrode during electro-slag remelting are presented. In the first part the heat necessary to melt an electrode with a flat tip shape is calculated. It is shown that to keep a constant melting rate, the heat supplied to the electrode must be continuously changed. The results for different electrode descend rates, corresponding to different melting rates, are presented. In the second part the melting process was simulated with the help of a numerical model which takes into account simultaneous action of magneto-hydrodynamics, and thermal and phase changes phenomena. The model assumes no mould current. Simulations were performed with constant applied current and electrode descend velocity. The simulations have shown that the coupling between the melting rate and the Joule heat release process is very unstable. One result showing a stable electrode tip is presented and discussed in details.

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Section: Two Dimensional Model Description For Esr Process Simulationmentioning

confidence: 99%

On Melting of Electrodes during Electro-Slag Remelting

Kharicha

Ludwig

2014

ISIJ Int.

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“…The detailed physical properties, geometry, and operating conditions are listed in Table I. [24,25,33,34] …”

Section: Fluid Flowmentioning

confidence: 99%

“…A linear relation between temperature and liquid fraction f ' is assumed as follows: [24][25][26][27] …”

Section: B Fluid Flowmentioning

confidence: 99%

A General Coupled Mathematical Model of Electromagnetic Phenomena, Two-Phase Flow, and Heat Transfer in Electroslag Remelting Process Including Conducting in the Mold

Wang

et al. 2014

Metall Mater Trans B

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A transient three-dimensional finite-volume mathematical model has been developed to investigate the coupled physical fields in the electroslag remelting (ESR) process. Through equations solved by the electrical potential method, the electric current, electromagnetic force (EMF), and Joule heating fields are demonstrated. The mold is assumed to be conductive rather than insulated. The volume of fluid approach is implemented for the two-phase flow. Moreover, the EMF and Joule heating, which are the source terms of the momentum and energy sources, are recalculated at each iteration as a function of the phase distribution. The solidification is modeled by an enthalpy-porosity formulation, in which the mushy zone is treated as a porous medium with porosity equal to the liquid fraction. An innovative marking method of the metal pool profile is proposed in the experiment. The effect of the applied current on the ESR process is understood by the model. Good agreement is obtained between the experiment and calculation. The electric current flows to the mold lateral wall especially in the slag layer. A large amount of Joule heating around the metal droplet varies as it falls. The hottest region appears under the outer radius of the electrode tip, close to the slag/metal interface instead of the electrode tip. The metal pool becomes deeper with more power. The maximal temperature increases from 1951 K to 2015 K (1678°C to 1742°C), and the maximum metal pool depth increases from 34.0 to 59.5 mm with the applied current ranging from 1000 to 2000 A.

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“…Kharicha et al reported the importance of mold current on the shape of slag‐pool interface and the distribution of Lorentz force. Furthermore, they pointed out the relationship between slag skin thickness, temperature fluctuation in the slag, and the amount of mold current . Increasing the amount of mold current may lead to decreasing the thickness of the slag skin.…”

Section: Special Topics In the Esr Processmentioning

confidence: 99%

Review on Modeling and Simulation of Electroslag Remelting

Kharicha

Karimi-Sibaki

et al. 2017

steel research int.

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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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Reformulation of time averaged Joule heating in presence of temperature fluctuations

Cited by 16 publications

References 5 publications

On Melting of Electrodes during Electro-Slag Remelting

On Melting of Electrodes during Electro-Slag Remelting

A General Coupled Mathematical Model of Electromagnetic Phenomena, Two-Phase Flow, and Heat Transfer in Electroslag Remelting Process Including Conducting in the Mold

Review on Modeling and Simulation of Electroslag Remelting

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