Modeling of Solidification Process in a Rotary Electromagnetic Stirrer

Pardeshi, R.; Singh, AK; Dutta, Pradip

doi:10.1080/10407780802553961

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…stationary [6,8,20,21], traveling [2,19], and rotating [22]) and coil location [23]. However, early work by El-Kaddah and colleagues [2], as well recent developments [24], has shown that the flow can be significantly altered when electrically conducting materials (magnetic shields) are located in the region between the coil and the melt in comparison to when the melt is "unshielded".…”

Section: Introductionmentioning

confidence: 98%

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On the Influences of Adjacent Conducting Media and Coil Frequency on the Electromagnetic Field and Flow Characteristics in Solidifying Melts

Poole¹,

Nastac

2015

Journal for Manufacturing Science and Production

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This paper examines the electromagnetic and flow field modification caused by the placement of electrically conducting media in the vicinity of the coil and molten metal and the corresponding influences of coil operating frequency. The electromagnetic field characteristics were numerically calculated using the mutual inductance technique. An improved dual-zone model was employed to describe flow behavior in the mushy region, and accounts for flow damping via interactions between the crystallites and the turbulent eddies. Calculations were performed for unidirectional solidification of an Al-4.5 wt% Cu alloy in a bottom-chill mold undergoing EM stirring. It was found that the presence of shields greatly modified the Lorentz force distribution within the melt. This led to noteworthy changes in the flow directionality, as well as changes in the spatial variation of temperature as solidification progressed. It was also found that these effects were most pronounced at low frequencies. The significance of these findings with respect to solidification process design will be discussed.

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Section: Introductionmentioning

confidence: 98%

“…A large share of EM solidification models uses approximate analytical solutions to define the Lorentz force distribution in the melt [4,22,25,26]. While such approaches are easy to implement, the solutions must assume either an infinite or semi-infinite medium along with a large degree of symmetry to simplify the boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

On the Influences of Adjacent Conducting Media and Coil Frequency on the Electromagnetic Field and Flow Characteristics in Solidifying Melts

Poole¹,

Nastac

2015

Journal for Manufacturing Science and Production

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“…By controlling the M-EMS current and frequency, stirring intensity in the liquid pool can be controlled [7], while inappropriate stirring intensity gives rise to a negative effect on as-cast billet or bloom including white band [8]. During the M-EMS process, induced electromagnetic torque is in fact motivation of putting molten steel into rotatory motion, and the desired stirring effects can be obtained [9]. Thus it can be concluded that electromagnetic torque corresponds to flow velocity used as a stirring process parameter.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic torque detecting for optimization of in-mould electromagnetic stirring in the billet and bloom continuous casting

Bao

Wang

et al. 2018

Ironmaking & Steelmaking

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In this paper, an electromagnetic torque device based on the theoretical model was established to determine the optimum frequency accurately and conveniently in billet and bloom continuous casting with in-mould electromagnetic stirring (M-EMS). Magnetic characteristics with M-EMS was investigated by numerical simulation and physical experiment with the application of electromagnetic torque device and gauss meter. In addition, the effects of stirring frequency with M-EMS on macro segregation and equiaxed crystal ratio were compared and analysed for 55SiCr with 150 mm × 150 mm billet caster and BU with 310 × 360 mm bloom caster by a series of plant trials, respectively. The results showed that maximum magnetic flux density and maximum electromagnetic torque occurred with different frequency and same current in M-EMS, and central equiaxed crystal ratio and macro segregation has been significantly improved by optimum frequency with M-EMS.

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“…The dual-zone model divides the mushy region into two domains: (i) the suspended particle region, and (ii) the fixed particle region, with the transition between regions occurring at the coherency point. In modeling EM solidification processes, the former model was used by Rappaz and coworkers 7) and Prescott and Incropera, 22) while the latter was used by Pardeshi et al 24) In each of these studies, an approximate analytical solution was used to describe the EM force field in the system. This limits the capability of these models to address the role of the coil design on the solidification behavior.…”

Section: Introductionmentioning

confidence: 99%

“…23,24) The single-zone model treats the entire twophase region as a porous medium, with the flow being damped via Darcy's law. The dual-zone model divides the mushy region into two domains: (i) the suspended particle region, and (ii) the fixed particle region, with the transition between regions occurring at the coherency point.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coil Design on the Temperature and Velocity Fields during Solidification in Electromagnetic Stirring Processes

Poole

El-Kaddah

2014

ISIJ Int.

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This paper examines the role of induction coil design on stirring of molten metal in electromagnetic (EM) solidification processes. A model is presented to describe the EM, heat transfer, and fluid flow phenomena in these processes. It is based on a dual-zone description of the mushy region, and accounts for damping of turbulence by the solidified crystallites. The electromagnetic field equations were solved using the mutual inductance technique, while the temperature and turbulent flow fields were calculated using the control volume method. Calculations were performed for solidification of an Al-Cu alloy placed in a stationary magnetic field generated by an induction coil. The effect of coil design on the flow structure was investigated for three different coil positions. It was found that changing the coil position significantly alters the flow pattern from four recirculating loops when the coil is above the midsection of the melt to two loops, typical of a travelling magnetic field, when the coil is at the base of the melt. This significantly modifies the rate of solidification across the ingot, as well as the temperature gradient, in the mushy region. The decay of the velocity and turbulent fields in the mushy region was found to be exponential, with the maximum rate of decay at the solidification front. These results indicate that through changes in coil design, it is possible to control the flow characteristics and solidification behavior in the molten metal.

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Modeling of Solidification Process in a Rotary Electromagnetic Stirrer

Cited by 16 publications

References 16 publications

On the Influences of Adjacent Conducting Media and Coil Frequency on the Electromagnetic Field and Flow Characteristics in Solidifying Melts

On the Influences of Adjacent Conducting Media and Coil Frequency on the Electromagnetic Field and Flow Characteristics in Solidifying Melts

Electromagnetic torque detecting for optimization of in-mould electromagnetic stirring in the billet and bloom continuous casting

Effect of Coil Design on the Temperature and Velocity Fields during Solidification in Electromagnetic Stirring Processes

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