Numerical examination of the evaporation process within a vacuum induction furnace with a comparison to experimental results

Buliński, Piotr; Smołka, Jacek; Siwiec, G.; Blacha, L.; Golak, S.; Przyłucki, R.; Palacz, Michał; Melka, Bartłomiej

doi:10.1016/j.applthermaleng.2019.01.008

Cited by 18 publications

(5 citation statements)

References 18 publications

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“…It is more difficult to estimate the actual evaporation surface (liquid copper surface). When metals or their alloys are melted in induction furnaces (vaccum induction melting -VIM or induction skull melting -ISM), the metal surface area is highly dependent on the electromagnetic field acting on the melt and the properties of the liquid metal [17][18][19][20][21][22]. This is shown by the formation of a distinct meniscus on the surface of the bath.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Removal of arsenic from liquid blister copper during remelting in an induction vacuum furnace

Łabaj

Blacha

Smalcerz

et al. 2021

J min metall B Metall

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Using a reduced pressure during the smelting and refining of alloys removes dissolved gasses, as well as impurities with a high vapor pressure. When smelting is carried out in vacuum induction furnaces, the intensification of the discussed processes is achieved by intensive mixing of the bath, as well as an enhanced mass exchange surface (liquid metal surface) due to the formation of a meniscus. This is due to the electromagnetic field applied to the liquid metal. This study reports the removal of arsenic from blister copper via refining in an induction vacuum furnace in the temperature range of 1423-1523 K, at operating pressures from 8 to 1333 Pa. The overall mass transfer coefficient kAs determined from the experimental data ranged from 9.99?10-7 to 1.65?10-5 ms-1. Arsenic elimination was largely controlled by mass transfer in the gas phase. The kinetic analysis indicated that the arsenic evaporation rate was controlled by the combination of both liquid and gas-phase mass transfer only at a pressure of 8 Pa.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Removal of arsenic from liquid blister copper during remelting in an induction vacuum furnace

Łabaj

Blacha

Smalcerz

et al. 2021

J min metall B Metall

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“…However, in the late 1990s, Fang and Ward [11] recognized temperature discrepancies at melt surface and emphasized that the experimental reports focused on the determination of evaporation rate constant differentiate from the theoretical predictions. Buliński et al [12] extensively discussed the mathematical model of the complex evaporation process within a vacuum induction furnace. They found an overall agreement between experimental results and theoretical estimates.…”

Section: Thermodynamic Considerationsmentioning

confidence: 99%

Thermodynamic and kinetics investigation of elemental evaporation from molten Al7Si4Cu alloy

Mitrašinović

Odanović

2021

Thermochimica Acta

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“…Titanium alloys are obtained on a large scale in arc furnaces and on a slightly smaller scale in induction furnaces with a cold crucible [ 30 , 31 ], but in both cases, only part of the batch is high purity, whereas the rest is contaminated [ 32 ]. A cold hearth is used to reduce titanium contamination in arc remelting, and a similar technique is used for cold crucible induction melting [ 33 ]. The melted titanium is in contact with the intensively cooled base of the furnace, where its surface layer solidifies and forms a titanium coating that prevents further contamination.…”

Section: Introductionmentioning

confidence: 99%

A Simulation Model for the Inductor of Electromagnetic Levitation Melting and Its Validation

et al. 2023

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This article presents a numerical model of electromagnetic levitation melting and its experimental validation. Levitation melting uses the phenomenon of magnetic induction to float a melted, usually metallic, conductor in an electromagnetic field. With the appropriate configuration of the coil (the source of the alternating magnetic field), the eddy currents induced in the molten batch interact with the coil magnetic field, which causes the melted metal to float without direct contact with any element of the heating system. Such a contactless process is very beneficial for melting very reactive metals (e.g., titanium) or metals with a high melting point (e.g., tungsten). The main disadvantage of levitation melting is the low efficiency of the process. The goal of the authors is to develop, by means of a numerical simulation and optimization tools, a system for levitation melting with acceptable efficiency. To achieve this, it is necessary to develop a reliable and representative computational model. The proposed model includes an analysis of the electromagnetic field, with innovative modeling of the convective heat transport. Experimental validation of the model was performed using aluminum alloy, due to the lack of the need to use a protective atmosphere and the ease of measurements. The measurements included electrical values, the melted batch positions during levitation, the melting time, and the temperature distribution in its area. The verification showed that the compliance between the computational model and the simulation for the position of the batch was accurate to 2 mm (6.25%), and the consistency of the batch melting time was accurate to 5 s (5.49%). The studies confirmed the good representativeness of the developed numerical model, which makes it a useful tool for the future optimization of the levitation melting system.

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Numerical examination of the evaporation process within a vacuum induction furnace with a comparison to experimental results

Cited by 18 publications

References 18 publications

Removal of arsenic from liquid blister copper during remelting in an induction vacuum furnace

Removal of arsenic from liquid blister copper during remelting in an induction vacuum furnace

Thermodynamic and kinetics investigation of elemental evaporation from molten Al7Si4Cu alloy

A Simulation Model for the Inductor of Electromagnetic Levitation Melting and Its Validation

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