Reverse flows and flattening of a submerged jet under the action of a transverse magnetic field

Kharicha, Abdellah; Vakhrushev, Alexander; Karimi-Sibaki, Ebrahim; Wu, Menghuai; Ludwig, Andreas

doi:10.1103/physrevfluids.6.123701

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…As it was very recently elucidated by the authors, the topology of the Lorentz force action on the submerged jet is very complex: it causes braking and flattening of the jet's core; simultaneously, the liquid from the bulk is accelerated and entrained due to the closure of the induced electric current lines. [ 44 ] That results in a formation of two reverse flow zones above and beneath the jets fed from the ports of the CC SEN; with growing EMBr power, they can initiate the opposite flow in the upper part of the CC mold. [ 33 ] One can see in Figure 4b that the jets become more stable, and the turbulent structures are significantly damped at the magnetic field presence.…”

Section: Resultsmentioning

confidence: 99%

Modeling Asymmetric Flow in the Thin‐Slab Casting Mold Under Electromagnetic Brake

Vakhrushev

Kharicha

Karimi-Sibaki

et al. 2022

steel research int.

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Continuous casting (CC) is nowadays the world‐leading technology for steel production. The thin slab casting (TSC) is featured by a slab shape close to the final products and a high casting speed. The quality of the thin slabs strongly depends on the uniformity of the turbulent flow and the superheat distribution, defining the solid shell growth against a funnel‐shaped mold. In most studies, it is commonly assumed that the submerged entry nozzle (SEN) is properly arranged, and the melt inflow is symmetric. However, the misalignment or clogging of the nozzle can lead to an asymmetric flow pattern. Herein, the asymmetry is imposed via a partial SEN clogging: a) a local porous zone inside the nozzle reflects the presence of the clog material; b) the resistance of the clog is varied from low to high values. The solidification during TSC is modeled, including the effects of the turbulent flow. The variation of the flow pattern and the solidified shell thickness are studied for different permeability values of the SEN clogging. These effects are considered with and without the applied electromagnetic brake (EMBr) using an in‐house magnetohydrodynamics (MHD) and solidification solver developed within the open‐source package OpenFOAM.

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Section: Resultsmentioning

confidence: 99%

Modeling Asymmetric Flow in the Thin‐Slab Casting Mold Under Electromagnetic Brake

Vakhrushev

Kharicha

Karimi-Sibaki

et al. 2022

steel research int.

Self Cite

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“…As recently revealed, one must bear in mind a complex topology of the Lorentz force in application to CC process. The damping action is accompanied by the formation of the reverse zones in the vicinity of the feeding jets (flattened along direct current (DC) magnetic field) [12] and inside the upper region of the CC mold [13,14], where the MHD flow vastly affects free surface flow [15]. The misalignment of the SEN or its clogging during operation are common issues in the CC process causing the jets / mean flow oscillations or / and asymmetry.…”

Section: Introductionmentioning

confidence: 99%

Effects of the asymmetric and oscillating turbulent melt flow on the heat transfer and solidification inside the thin slab continuous casting (TSC) mold under the applied electromagnetic brake (EMBr)

Vakhrushev,

Karimi-Sibaki,

et al. 2024

J. Phys.: Conf. Ser.

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The thin slab casting (TSC) is a breakthrough near-net-shape technique for flat products accompanied by rapid casting and solidification rates. The TSC quality hinges on the turbulence, super-heat flow and growth of the solidified shell. The electromagnetic brake (EMBr) is commonly applied to control the fresh melt flow after feeding through a submerged entry nozzle (SEN). Numerical modelling is a perfect tool to investigate the multiphase phenomena in the continuous casting (CC). The presented study considers the heat transfer through the solid shell and water-cooled copper mold including the averaged thermal resistance of the slag skin and the air gap coupled with the turbulent flow and magnetohydrodynamics (MHD) model using an in-house code developed inside the open-source computational fluid dynamics (CFD) package OpenFOAM®. The model is applied to investigate different undesired asymmetric melt flow issues: (i) with the misaligned or (ii) partially blocked SEN; (iii) caused by the mean flow fluctuations with the natural frequencies; (iv) related to the oscillations of the fresh melt jets for the specific SEN designs and casting regimes. The variation of the flow pattern and superheat distribution is studied and presented for different scenarios both with and without applied EMBr.

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“…Although this device has produced favorable results, recent works have shown that the magnetic field's features must be tuned carefully. Specifically, an undesirable hydrodynamic behavior inside the mold is obtained when the magnetic field is set incorrectly [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of the Influence of the Sliding-Gate Valve on Submerged Entry Nozzle Outlet Jets

Gonzalez-Trejo,

Miranda-Tello,

Gabbasov

et al. 2024

Fluids

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This work studies how the sliding-gate valve (SGV) modifies the features and the dynamic behavior of the outlet jets for flat-bottom and well-bottom bifurcated submerged entry nozzles (SENs) used in continuous casting machines. Three conditions for the SGV were studied: no obstruction, moderate obstruction, and severe obstruction. The experimental study used a scaled model, employing cold water as the working fluid. A high-frequency analysis of the flow inside the SEN’s bore arriving at the outlet ports was performed by employing the particle image velocimetry (PIV) technique. Low-frequency measurements of the volumetric flow at the exit port were obtained by splitting the exit jet into four quadrants and employing digital flowmeters. It was observed that reducing the SGV clearance increases the turbulence of the flow inside the SEN bore, but the flow displays ordered rather than erratic fluctuations. Flowmeter measurements showed that, regardless of the level of obstruction in the SGV, the outlet jets on flat-bottom and the well-bottom SENs have dynamic behaviors and features with significant differences. This finding is relevant because the flow distribution inside the outlet ports is directly related to the jet’s wideness, affecting the recirculation pattern inside the mold and, therefore, the quality of the finished steel slab.

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Reverse flows and flattening of a submerged jet under the action of a transverse magnetic field

Cited by 9 publications

References 22 publications

Modeling Asymmetric Flow in the Thin‐Slab Casting Mold Under Electromagnetic Brake

Modeling Asymmetric Flow in the Thin‐Slab Casting Mold Under Electromagnetic Brake

Effects of the asymmetric and oscillating turbulent melt flow on the heat transfer and solidification inside the thin slab continuous casting (TSC) mold under the applied electromagnetic brake (EMBr)

Experimental Analysis of the Influence of the Sliding-Gate Valve on Submerged Entry Nozzle Outlet Jets

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