Physical Modeling of Mold Slag Entrainment in Continuous Steel Casting Mold with Consideration the Impact of Mold Powder Layer

Bielnicki, M.; Jowsa, J.

doi:10.1002/srin.201800110

Cited by 20 publications

(10 citation statements)

References 25 publications

(39 reference statements)

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“…(4) The slag drop is transported and dragged deep into the mold, see Figure 7d, and is then finally entrapped by the solidified shell. This entrapment is caused by the vortexing formation in steel, which is usually found near the SEN. A similar phenomenon is also found in Saeedipour's experiment in reference [13], which can also give support to our predicted results. This type of slag entrapment is commonly seen during the injection of steel, indicating that the 1/4 zone, see Figure 1b, is the most likely area where slag entrapment in steel occurs.…”

Section: Validation Of Mathematical Modelsupporting

confidence: 92%

“…Therefore, in addition to the observations stated above, we put forward another simulation work to compare with the experimental result reported by Bielnicki et. al [13] using our three-phase model. It can be seen from Figure 4a that due to the up-recirculation of the water stream, the slag is accumulated near the center of the wide face, thus leading to the fact that the slag layer is rather thin near the narrow wall of the mold.…”

Section: Validation Of Mathematical Modelmentioning

confidence: 99%

“…Similarly, Kasai and Iguchi [12] also observed oil droplet entrapment near SEN; however, this was caused by vortex formation. Recently, Bielnicki and Jowsa [13] compared the existence of slag powder's effect on the slag entrapment, showing that the presence of mold powder influenced the critical casting speed. All these works are beneficial for understanding the slag entrapment in steel.…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation of Multi-Phase Flow and Slag Entrapment in a Continuous Casting Mold

Liu

et al. 2018

Metals

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A transient, three-dimensional mathematical model has been developed to study the slag entrapment in a continuous casting mold. The unsteady turbulent flow is computed using the large eddy simulation (LES). The sub-grid scale structure is modeled by the Smagorinsky-Lilly model. The movements of discrete bubbles, as well as three continuous phases (air-slag-steel), are described by solving the coupled discrete particle model and volume of fraction (DPM+VOF) approach. The bubble transport inside different phases (steel and slag) and the escape near the air-slag interface are well studied. Good agreement is obtained by comparing with the plant observation of the slag eyes on the top surface of the mold. Three main mechanisms of slag entrapment are identified; vortex formation, shear-layer instability, and meniscus fluctuation. Four stages are observed for a slag entrapment: deformation, necking, breaking, and dragging in the mold. The model is helpful for understanding the formation of slag entrapment during continuous casting.

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Section: Validation Of Mathematical Modelsupporting

confidence: 92%

Section: Validation Of Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation of Multi-Phase Flow and Slag Entrapment in a Continuous Casting Mold

Liu

et al. 2018

Metals

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“…Thanks to that, it was possible to check mathematical model used in computer calculations. A physical model of tundish is constructed of glass, on a 2:5 scale (a similar scale of water model was used in another works [31,32]), which has a nominal capacity of 210 L [33]. The hydraulic system and flow meter are used to control the liquid flow in the physical model.…”

Section: Methodsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Bartosiewicz¹,

Cwudziński²

2019

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In this work, the authors proposed a modification of the working space one-strand tundish adapted for slab casting process. Numerical simulations of liquid steel flow in the considered flow reactor were performed. The tundish is equipped with a dam with a multi-hole filter. Two variants of the filter hole arrangement were tested and their effect on the liquid steel flow hydrodynamic structure in the tundish was examined. The computer calculations results were verified by performing experiments on the water model. The result of numerical and physical simulations an RTD (Residence Time Distribution) type F curve was generated, which define the transition zone between the cast steel grades during the sequential casting process. The results of the researches showed that the modification of a dam with a multi-hole filter affects on the formation of the liquid steel flow hydrodynamic structure and the transition zone. Furthermore, examinations of the liquid steel refining ability in the considered tundish were carried out. The influence of the filter holes arrangement on the non-metallic inclusions flotation process to the slag phase and liquid steel filtration processes was checked. Numerical simulations were performed in the Ansys-Fluent computer program.

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“…Zhang et al [7] found that the important factor affecting the absorption of slag and inclusions is the surface fluctuation of the velocity, which is caused by the flow field distribution inside the mold. Bielnicki et al [8] found that the conditions of entrained oil are variable and depend on experimental factors. For oils with viscosities of 0.0528 and 0.3748 Pa•s, the presence of mold powder influences the increase in critical water model casting speed.…”

Section: Introductionmentioning

confidence: 99%

Study on Multiphase Flow in a Wide-Width Continuous Casting Mold

et al. 2022

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The multiphase flow in the mold has a significant impact on the surface quality of the slab. In this paper, the multiphase flow in the mold is studied by establishing a one-quarter scale water mold, with the aid of a high-speed camera and particle image velocimetry (PIV). The oil phase will make the liquid surface velocity around the nozzle smaller. The greater the viscosity of the oil, the greater the critical water model casting speed and the shallower the critical immersion depth of submerged entry nozzle (SEN). Blowing will enhance the turbulence of the flow field in the mold and have a suppressing effect on the surface velocity. However, the vertical velocity of the narrow surface does not change significantly. The randomness of the bubble entering the mold from the nozzle can easily cause asymmetry of the instantaneous flow. The number of bubbles with a diameter less than 1 mm increase with the increase in gas flow rate. The larger the bubble size, the more buoyant around the nozzle when it escapes. The larger the diameter of bubble, the closer the vortex center of the upper circulation is to the nozzle and the closer the center of the lower circulation is to the narrow surface.

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Physical Modeling of Mold Slag Entrainment in Continuous Steel Casting Mold with Consideration the Impact of Mold Powder Layer

Cited by 20 publications

References 25 publications

Large Eddy Simulation of Multi-Phase Flow and Slag Entrapment in a Continuous Casting Mold

Large Eddy Simulation of Multi-Phase Flow and Slag Entrapment in a Continuous Casting Mold

Archives of Metallurgy and Materials

Study on Multiphase Flow in a Wide-Width Continuous Casting Mold

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