Flow Oscillations and Meniscus Fluctuations in a Funnel-Type Water Mold Model

Jeon, Young Jin; Sung, Hyung Jin; Lee, Sang‐Min

doi:10.1007/s11663-009-9318-z

Cited by 30 publications

(26 citation statements)

References 17 publications

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“…However, several researchers from both industry and academia have proven various devices and operating strategies in order to improve the quality of steel produced through this process [1][2][3][4]. Surface defects and slag entrapment are significant defects that deteriorate the quality of steel that is produced by the continuous casting process [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold

Gonzalez-Trejo

Real-Ramirez

Miranda-Tello

et al. 2017

Archives of Metallurgy and Materials

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Some of the most recent technologies that improves the performance in continuous casting process has installed infrastructure outside the mold to modify the natural fluid flow pattern to obtain a quasi-steady condition and promote a uniform solidified shell of steel. The submerged entry nozzle distributes the liquid steel in the mold and can be used to obtain the flow symmetry condition with external geometry improvements. The fluid flow conditioners were located near the outlet ports of the nozzle. The aim of the modifiers is to impose a pseudo symmetric pattern in the upper zone of the mold by inhibiting the fluid exchange between the zones created by conditioners. This work evaluates the effect of the thickness and length of the fluid-flow modifiers on the overall performance of the submerged nozzle. These properties of the fluid-flow modifiers were normalized based on two of the geometric dimensions of the standard equipment. Numerical and physical simulations suggest that the flow modifier should be as thin as possible.

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Section: Introductionmentioning

confidence: 99%

Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold

Gonzalez-Trejo

Real-Ramirez

Miranda-Tello

et al. 2017

Archives of Metallurgy and Materials

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“…With the radial flow SEN, the maximum velocity and temperature distribution at the top free surface is obviously larger than that of using the straight SEN. Considering that low temperature and inactive meniscus status induced by the straight SEN are bad for the function of mold flux, which could give rise to bad strand quality and it implies the radial flow SEN has a better performance than that of using the straight SEN. Also, due to that the flow structures inside the mold have a significant influence on the meniscus, 22) though there is a high horizontal velocity magnitude near the fillet using the radial flow SEN as Fig. 4(b) shows, the fluctuation is not obvious.…”

Section: Top Free Surface Characteristicsmentioning

confidence: 98%

Transport Phenomena in a Beam-Blank Continuous Casting Mold with Two Types of Submerged Entry Nozzle

Zhu

2015

ISIJ Int.

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A three-dimensional full-coupled mathematical model is established to study the fluid flow, heat transfer and solidification in a 450 mm × 350 mm × 90 mm beam-blank mold with two different types of submerged entry nozzle (SEN), namely single-port straight SEN and three-port radial flow SEN. Water modeling experiments, industrial trials and public results available in literature are performed to validate the numerical results. The results show that, with the straight SEN which has been widely applied in beam-blank continuous casting, there is a very inactive top free surface in the mold which level fluctuation magnitude is less than 1 mm and velocity magnitude is far from a reasonable interval, and the shell thickness distribution at the mold exit is very uneven, thick at the web but thin at the fillet. Moreover, there exists a "wavy contour" at the flange due to the washing effect of the off-center molten steel jet. While with the new designed radial flow SEN, a suitable meniscus status and a more uniform shell thickness at the mold exit can be obtained, which is helpful to avoid the breakouts caused by the rupture of thin fillet and the flange depression. The "self-braking" effect caused by two radial flow SENs provides good flow stability at the web center.

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“…The examination of this phenomenon under industrial conditions faces great difficulties (due to the high temperature, the lack of transparency of all phases), therefore alternative methods are being developed to enable the understanding of the fundamental physical phenomena occurring in the area of the forming meniscus. To this end, water models [6,7], laboratory models relying on low-melting point alloys [8], or numerical modelling using appropriate mathematical descriptions are employed [8,9].…”

Section: Introductionmentioning

confidence: 99%

Multiphase Numerical Model of Molten Steel and Slag Behavior in the Continuous Casting Mould

Bielnicki

Jowsa

Cwudziński

2015

Archives of Metallurgy and Materials

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The paper reports the results of numerical simulation of the flow of liquid steel with the use of a multiphase model. The facility under study was a mould designed for continuous casting of steel slabs. The geometry of the facility, along with the computational grid, was generated within the program Ansys-Meshing R . Numerical computations were performed in the programs: COMSOL Multiphysics R and Ansys-Fluent R . The use of the multiphase model enabled the determination of the behavior of the liquid slag layer on the metal bath surface. From the performed computer simulations, the fields of liquid steel motion and liquid steel turbulence kinetic energy distribution in the mould's symmetry plane have been presented. Based on the values recorded at selected measurement points located on the slag surface, a diagram illustrating the variation of the slag layer position during continuous steel casting has been plotted.Keywords:continuous casting mould, liquid steel, slag, multiphase fluid flow model W niniejszej pracy przedstawiono wyniki symulacji numerycznej przepływu ciekłej stali z wykorzystaniem modelu wielofazowego. Badanym obiektem był krystalizator przeznaczony do ciągłego odlewania stalowych wlewków płaskich. Geometrię obiektu wraz z siatkę obliczeniową wygenerowano w programie Ansys-Meshing R . Obliczenia numeryczne wykonano w programach: COMSOL Multiphysics R i Ansys-Fluent R . Zastosowanie modelu wielofazowego pozwoliło na określenie zachowania się warstwy ciekłego żużla na powierzchni kąpieli metalowej. Na podstawie wykonanych symulacji komputerowych zaprezentowano pola ruchu ciekłej stali oraz rozkładu kinetycznej energii turbulencji ciekłej stali w płaszczyźnie symetrii krystalizatora. Bazując na wartościach zarejestrowanych w wybranych punktach pomiarowych, znajdujących się na powierzchni żużla, sporządzono wykres obrazujący zmianę położenia warstwy żużla podczas ciągłego odlewania stali.

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Flow Oscillations and Meniscus Fluctuations in a Funnel-Type Water Mold Model

Cited by 30 publications

References 17 publications

Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold

Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold

Transport Phenomena in a Beam-Blank Continuous Casting Mold with Two Types of Submerged Entry Nozzle

Multiphase Numerical Model of Molten Steel and Slag Behavior in the Continuous Casting Mould

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