Influence of magnetic flux concentrator on the induction heating process in crystal growth systems-geometry investigation

Heidari, Hamed; Tavakoli, Mohammad Hossein; Sobhani, Sayed Omid; Honarmandnia, Mohtaram

doi:10.1039/c8ce00965a

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…In most cases, it is impossible to deduce the electromagnetic and temperature distribution analytically. Therefore, finite element method (FEM)-based numerical simulation has become a popular mean used by many researchers to analyze the induction heating process in industrial applications, including metal forming, 6–13 melting 14 and molding, 15 crystal growing, 16 wafer packaging, 17,18 and welding process. 19,20 Cho 6 established a cost-effective coupled electromagnetic-thermal model to numerically analyze the solutions of both stationary and moving workpiece under low frequency induction heating system, which could predict more precise results of temperature distribution in the variable magnetic field than the previous model.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study of electromagnetic induction heating process for bolted flange joints

Liu

Xie

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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As a promising metalwork processing technology, electromagnetic induction heating (EMIH) method has been applied in dealing with bolted flange joints in turbomachinery. In this study, a 3-D finite element model of electromagnetic induction heating system for the bolted flange joint is established, and the specific governing equations are derived based on Maxwell’s principle. The alternately-coupled magneto-thermal analysis is carried out considering temperature-dependent material properties to obtain the temperature distribution, followed with the uncoupled thermal-mechanical analysis to acquire the axial stress and deformation in EMIH process. The magnetic induction intensity mainly concentrates at the inner wall region, attenuates seriously along the radial direction, and reduces to almost zero at the outer wall. Due to the skin effect, the heat transfers radially and axially outward, indicating a diamondlike-shaped development from the center to the surrounding region. The axial stress with and without initial pretension are also discussed respectively. Then the corresponding experiments are introduced and carried out to validate the reliability of numerical simulation results. By comparing the results of the center point of inner surface and outer surface, the numerical simulation is proved reliable with a 5∼10% reasonable deviation. Further, the induction heating process has been improved through the optimization method based on pattern search algorithm. By adopting the stepped input current density optimized in the study, the optimal thermal stress tends to be constant and the final heating time reduces by 20.5% in the safe range of stress.

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Section: Introductionmentioning

confidence: 99%

“…In terms of crystal growth system, Heidari et al. 16 illustrated the significant effect of different MFC structural forms on the electromagnetic field distribution as well as heating rate in the induction heating process. Selective induction heating has been developed in wafer bonding and packaging technology.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of electromagnetic induction heating process for bolted flange joints

Liu

Xie

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Up to now, several papers about this subject, have been written by relying on numerical study and computer modeling approaches [for example ref. []]. Although the heating part is usually assumed to be symmetric in a growth setup but in fact it is asymmetric and has a 3D shape .…”

Section: Introductionmentioning

confidence: 99%

3D Simulation of the Coil Geometry Effect on the Induction Heating Process in Czochralski Crystal Growth System

Heidari

Tavakoli

shokri

et al. 2020

Crystal Research and Technology

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Herein, influence of coil geometry in a Czochralski crystal growth system is studied using 3D finite element method. Three different geometries for the helical RF‐coil including solenoid, conical solenoid, and rectangular are considered and distribution of magnetic flux density (through the system), produced heat in the RF‐coil and the graphite crucible, as well as heat volume integral are calculated. The obtained numerical results show that every considered coil produces a special heating structure due to its shape with some advantages and disadvantages.

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Electromagnetic Safety and Minimum Wall Thickness of a Steel Chamber for Inductive Czochralski Crystal Growth Furnace

Hadidchi

Tavakoli²

2023

JOM

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Influence of magnetic flux concentrator on the induction heating process in crystal growth systems-geometry investigation

Abstract: In this paper, a magnetic flux concentrator (MFC) is reported, and its geometry effect on the induction heating process has been calculated in a Czochralski crystal growth system using the 2D finite element method.

Cited by 7 publications

References 34 publications

Numerical and experimental study of electromagnetic induction heating process for bolted flange joints

Numerical and experimental study of electromagnetic induction heating process for bolted flange joints

3D Simulation of the Coil Geometry Effect on the Induction Heating Process in Czochralski Crystal Growth System

Electromagnetic Safety and Minimum Wall Thickness of a Steel Chamber for Inductive Czochralski Crystal Growth Furnace

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