Transient Thermo-fluid Model of Meniscus Behavior and Slag Consumption in Steel Continuous Casting

Jonayat, A S M; Thomas, Brian G.

doi:10.1007/s11663-014-0097-9

Cited by 55 publications

(71 citation statements)

References 59 publications

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“…43,44) In the totally solid state, a constant value of 0.5 W/m K is used, which is similar to the previous models. 24,25) The temperature denpendent specific heat of slag, as shown in Fig. 6, is based on reasonable estimates from the partial molar heat capacity values for individual components.…”

Section: )mentioning

confidence: 98%

“…Many analytical transient models of liquid slag flow and slag consumption have been formulated to investigate the interfacial slag behavior between the solidifying steel shell and the mold wall. [16][17][18][19][20][21][22][23][24] McDavid and Thomas 25) applied a three-dimensional (3-D) FIDAP model to analyze the fluid flow and heat transfer of the top-surface flux layers. The predicted flux layer thicknesses were matched with experimental measurements, and a large recirculation zone in the liquid slag pool was observed by these model calculations.…”

Section: Transient Thermo-fluid and Solidification Behaviors In Contimentioning

confidence: 99%

“…This model has been widely used to predict the shell thickness, slag layer thickness, temperature distributions in the mold and shell, heat flux profiles, transient shear stress, and other related phenomena. Based on the output from the CON1D model, a computational model by Jonayat and Thomas,24) solved the Navier-Stokes equations, turbulence, and energy equations. This method was applied to describe the transient thermal-flow in the meniscus region during an oscillation cycle and to predict the slag consumption for arbitrary conditions, such as casting speed, frequency, stroke, and modification ratio, which was validated with both lab and plant measurements.…”

Section: )mentioning

confidence: 99%

“…Previous works 24,26,36) have shed light on the effect of casting speed on fluid flow, heat transfer, and solidification in the mold, but the continuous and associated phenomena are not described, especially at the initial stage of casting process. Figure 12 shows the variations of meniscus level and liquid pool depth measured at a location 40 mm from the mold during the casting process.…”

Section: Evolution Phenomenamentioning

confidence: 99%

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Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

2018

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Section: )mentioning

confidence: 98%

Section: Transient Thermo-fluid and Solidification Behaviors In Contimentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Evolution Phenomenamentioning

confidence: 99%

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Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

2018

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“…The model is based on the commercial software ANSYS-Fluent 14.0, and solves the Navier-Stokes equations [11] coupled with the volume of fluid (VOF) method for calculation of phase fractions and the continuum surface force (CFS) method for tracking the steel-slag-air interfaces. where α is the phase fraction and the subscripts p and q represent any two of the three phases present in the cell (steel, slag or air).…”

Section: Governing Equationsmentioning

confidence: 99%

A coupled model on fluid flow, heat transfer and solidification in continuous casting mold

2017

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Fluid flow, heat transfer and solidification of steel in the mold are so complex but crucial, determining the surface quality of the continuous casting slab. In the current study, a 2D numerical model was established by Fluent software to simulate the fluid flow, heat transfer and solidification of the steel in the mold. The VOF model and k-ε model were applied to simulate the flow field of the three phases (steel, slag and air), and solidification model was used to simulate the solidification process. The phenomena at the meniscus were also explored through interfacial tension between the liquid steel and slag as well as the mold oscillation. The model included a 20 mm thick mold to clarify the heat transfer and the temperature distribution of the mold. The simulation results show that the liquid steel flows as upper backflow and lower backflow in the mold, and that a small circulation forms at the meniscus. The liquid slag flows away from the corner at the meniscus or infiltrates into the gap between the mold and the shell with the mold oscillating at the negative strip stage or at the positive strip stage. The simulated pitch and the depth of oscillation marks approximate to the theoretical pitch and measured depth on the slab. https://doi.org/10.1007/s41230-017-7171-2 I n the continuous casting process of the slab, many complex phenomena [1][2][3] occur in the mold, including fluid flow, heat transfer, steel solidification, interaction between steel and slag [4] , etc. The liquid steel flows into the mold cavity through the submerged entry nozzle (SEN) and then solidifies against the four walls of the water-cooling copper mold. The solidified shell is continuously withdrawn downward at the casting speed. The slag powder is continuously added on the top of the steel, then melts or sinters to form a slag bed, and liquid slag infiltrates into the gap between the shell and the mold [5,6] . Due to the interfacial tension, a curved meniscus [7] forms between liquid steel and liquid slag, and solidifies with the heat transfer from the steel to the mold. Heat transfer and solidification of the liquid steel at the meniscus as well as the mold oscillation affect the formation of the oscillation marks [8] , which may cause some defects in the slab, including slag entrapment [9] , bubble and inclusion capture, element segregation, transverse cracks [10] , etc. In the current study, a 2D model was established to simulate the multiphase fluid flow of steel-slagair, heat transfer and solidification in the mold with mold oscillation. The model considered the interfacial tension between different phases and shell movement at the casting speed. The phase distribution and flow field in the mold were simulated, and phenomena near the meniscus were presented, including meniscus solidification, slag penetration and movement of the mold and the shell. The comparison of simulated pitch and depth of oscillation marks with theoretical pitch and measured depth on the slab surface was conducted to validate the accuracy of the...

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Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Wang

Zhu

Zhou

2017

steel research int.

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The initial solidification of molten steel in the mold is very important, as it is the origin of the final slab, which associates with the surface defects and determines the final quality of casting slab. In this article, six main topics, including the initial solidification study method, molten steel solidification, mold flux structure, fluid flow, oscillation marks formation, and breakout are reviewed with the purpose to explore the intrinsic mechanism of the complex initial solidification process and its related multi-phase heat transfer phenomena. The results summarized here can provide a foundational understanding of the initial solidification and heat transfer phenomena occurring in the continuous casting mold.

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Transient Thermo-fluid Model of Meniscus Behavior and Slag Consumption in Steel Continuous Casting

Cited by 55 publications

References 59 publications

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Evolution Phenomena

A coupled model on fluid flow, heat transfer and solidification in continuous casting mold

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

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