Numerical and experimental thermal analysis for a metallic hollow cylinder subjected to step-wise electro-magnetic induction heating

Jang, Ji Yeon; Chiu, Yu-Wei

doi:10.1016/j.applthermaleng.2006.12.025

Cited by 73 publications

(35 citation statements)

References 13 publications

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“…It is noted that the convection boundary condition is neglected since its order is 3% compared to the radiation effect when there is a large difference in temperature between the workpiece and the ambient [20]. …”

Section: Temperature Fieldmentioning

confidence: 99%

Coupled electro-magneto-thermal model for induction heating process of a moving billet

Cho

2012

International Journal of Thermal Sciences

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Section: Temperature Fieldmentioning

confidence: 99%

Coupled electro-magneto-thermal model for induction heating process of a moving billet

Cho

2012

International Journal of Thermal Sciences

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“…For instance, Codrington et al [15] developed the high temperature measuring equipment, with which the thermocouples are used to measure the heating temperature and provide a feedback signal for PID control of the induction heater. Jang et al [16] applied the thermocouples and infrared thermal imaging system, respectively, to measure comparatively the temperatures at the inside and outside surface of a steel hollow cylinder during the induction heating process. Franco et al [17] proposed an infrared sensor and detected the real-time temperature evolution.…”

Section: Introductionmentioning

confidence: 99%

“…The Ag-Cu-Ti filler alloy melts merely within a narrow zone owing to the heating resulted from the heated wheel substrate of AISI 1045 steel. Magnetic properties of Ferrotron 559H[16] Point A and two reference paths 3 Results and discussion 3.1 Typical contour and evolution of temperature distribution in high-frequency induction heating…”

mentioning

confidence: 99%

Understanding the temperature distribution and influencing factors during high-frequency induction brazing of CBN super-abrasive grains

Ding

Zhu

et al. 2016

Int J Adv Manuf Technol

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The temperature distribution characteristics in high-frequency induction brazing of cubic boron nitride (CBN) super-abrasive grains is investigated based on finite element simulation in this article. Influences of the following factors, i.e., current frequency, current magnitude, heating gap, and scanning speed, on the resultant heating temperature are discussed. The results obtained display that, during the rotating induction heating process, the effective heating zone is concentrated on the top surface of the metallic wheel substrate (i.e., AISI 1045 steel) below the coil. The highest value of the resultant heating temperature becomes larger when heating with a higher current frequency, a higher current magnitude, and smaller heating gap values; however, a higher peripheral scanning speed results in a decrease of the resultant highest temperature. The optimum parameters are determined as the heating gap of 2 mm, current frequency of 1 MHz, current magnitude of 20 A, and peripheral scanning speed of 0.5 mm/s. Finally, the simulation results are testified and validated in the high-frequency induction brazing experiment of CBN grains.

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“…For the case where the fi elds cannot be assumed to be homogeneous [2], a popular approach is describing the fi eld is terms of the vector potential A whose rotor is equal to the magnetic fi eld intensity H = 1 − μ ∇ ∇ × A. This approach is convenient because the Maxwell equations can be reduced to the relation 2 out…”

mentioning

confidence: 99%

“…The calculation is performed in an expanded region incorporating the crucible with a metal, the inductor, and the environment. Such a geometry is necessary for satisfying the boundary condition A = 0 at infi nity [2,5].…”

mentioning

confidence: 99%

Mathematical Model of the Processes of Heat and Mass Transfer and Diffusion of the Magnetic Field in an Induction Furnace

Perminov

Nikulin

2016

J Eng Phys Thermophy

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We propose a mathematical model describing the motion of a metal melt in a variable inhomogeneous magnetic fi eld of a short solenoid. In formulating the problem, we made estimates and showed the possibility of splitting the complete magnetohydrodynamical problem into two subproblems: a magnetic fi eld diffusion problem where the distributions of the external and induced magnetic fi elds and currents are determined, and a heat and mass transfer problem with known distributions of volume sources of heat and forces. The dimensionless form of the heat and mass transfer equation was obtained with the use of averaging and multiscale methods, which permitted writing and solving separately the equations for averaged fl ows and temperature fi elds and their oscillations. For the heat and mass transfer problem, the boundary conditions for a real technological facility are discussed. The dimensionless form of the magnetic fi eld diffusion equation is presented, and the experimental computational procedure and results of the numerical simulation of the magnetic fi eld structure in the melt for various magnetic Reynolds numbers are described. The extreme dependence of heat release on the magnetic Reynolds number has been interpreted.Keywords: induction melting, superalloy, variable magnetic fi eld, magnetic fi eld diffusion, inductive current, heat and mass transfer, convection, multiscale method, averaging method.Introduction. Induction heating is widely used in various fi elds of metallurgy and in precision production of semiconductor dielectric elements: induction melting, zone melting, strengthening of the surface of metal products, crystal growing, and production of optical fi bers. The main idea of induction heating is the use of the Joule heat of currents induced in a conducting material by a variable external magnetic fi eld. The power released by the currents leads to local heating of the material and, consequently, to changes in the density and equilibrium concentration of elements. The description of the heat and mass transfer in such systems requires, as a rule, solving a system of electrodynamical, thermal energy transfer, and mass transfer equations.If the pulse rate of the fi eld is fairly high, then the resulting magnetic fi eld composed of the external fi eld of the inductor and the fi elds of inductive currents attenuates into the depth of the conductor and becomes practically zero at some distance ζ from its surface [1]. Within the limits of the boundary layer ζ, inductive currents (heat sources) and bulk electromagnetic forces acting on the moving melt are localized. Such an approach is convenient if the intensity near the conductor surface is known.For the case where the fi elds cannot be assumed to be homogeneous [2], a popular approach is describing the fi eld is terms of the vector potential A whose rotor is equal to the magnetic fi eld intensity H = 1

show abstract

Numerical and experimental thermal analysis for a metallic hollow cylinder subjected to step-wise electro-magnetic induction heating

Cited by 73 publications

References 13 publications

Coupled electro-magneto-thermal model for induction heating process of a moving billet

Coupled electro-magneto-thermal model for induction heating process of a moving billet

Understanding the temperature distribution and influencing factors during high-frequency induction brazing of CBN super-abrasive grains

Mathematical Model of the Processes of Heat and Mass Transfer and Diffusion of the Magnetic Field in an Induction Furnace

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