Water modelling of level fluctuation in thin slab continuous casting mould

Shen, Bingzhen; Shen, Houfa; Liu, B. C.

doi:10.1179/174328107x174618

Cited by 20 publications

(14 citation statements)

References 11 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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“…Shen et al [2][3] studied the free surface instability in a full scale continuous thin slab casting mould using particle image velocimetry and found that the level fluctuation, the circulation center position and the jet impinging depth are unsteady with a similar period. They also found that the wave height mainly depends on the jet impinging depth and the circular center position [2][3].…”

Section: Introductionmentioning

confidence: 98%

“…The fluid flow inside the mold produces significant variations of the liquid steel free surface and therefore, is very difficult to obtain an accurate value of the level. Many experimental works have been devoted to study these variations [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Level Estimation in a Water Model of Continuous Casting

Sánchez¹,

Miranda-Tello

Real-Ramirez

et al. 2010

2010 IEEE Electronics, Robotics and Automotive Mechanics Conference

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Fluctuations in the level of a physical model of a continuous casting mold were studied to determine the structure of the oscillations in the molten steel level. A water model of one third of scale of an actual continuous casting machine with a perfect control configuration was used in experiments. The liquid level in the mold is measured by recording at high-speed the level fluctuations and then detecting the edges on each of the recorded images. In this work, the Sobel operator was employed. The results show that level fluctuations inside the mold have a complex structure that is repeated in large time periods.

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“…Lo anterior, origina la presencia de otros fenómenos tales como vórticidades debido al flujo altamente turbulento existente al interior del molde [5][6][7]13]. Estos fenóme-nos tienen un efecto negativo ocasionando que la capa de polvos lubricantes y transferencia de calor no sean homogéneos, exista atrapamiento de escoria hacia el seno de metal líquido y agrietamientos en la superficie del planchón producido [9][10][11][12].…”

Section: Introductionunclassified

Simulación matemática para la optimización del patrón de flujo entregado por una buza para el molde de colada continua de planchón delgado

2018

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RESUMENEntender el comportamiento de las oscilaciones de los chorros al interior del molde de planchón delgado tipo embudo es esencial para asegurar una entrega de acero líquido constante, mejorar el control de los patrones de flujo y consecuentemente incrementar la productividad de la planta y la calidad del producto final. Para lograr esto se llevó a cabo un estudio del efecto del diseño interno de la buza sobre la fluido dinámica del molde, intentando determinar el origen de las oscilaciones de los chorros. Se hizo uso de la simulación matemática para estudiar éstos fenómenos.En la modelación matemática, se recurrió a las ecuaciones fundamentales, el modelo de turbulencia RSM y el modelo Multifásico VOF. Las ecuaciones gobernantes son discretizadas y resueltas mediante el método iterativo-segregado implícito implementado en FLUENT®.Los resultados, de la simulación matemática, muestran que aun para diseños de buza con un comportamiento operacional estable, las oscilaciones de los chorros permanecen presentes y se hacen más intensos para altas velocidades de colada e inmersiones de buza profundas. El análisis de cada una de las buzas simuladas muestra que la geometría interna origina perturbaciones en el flujo en las zonas donde las áreas transversales internas cambian, generando presiones dinámicas altas y bajas promoviendo una tendencia para que el acero líquido salga preferentemente por uno de los puertos. Se encontró un delicado balance de fuerzas, el cual, se da sobre sobre la punta de la bifurcación interna de la buza. Este balance está relacionado con las velocidades fluctuantes y la presión ferrostática. Si este balance es roto las oscilaciones son más intensas, originando variaciones permanentes de la velocidad de flujo másico de un puerto a otro. Además, se encontró que existe la formación continua de un camino de vórtices el cual se genera a partir de la separación de la capa límite en el divisor de los puertos, fenómeno que intensifica la oscilación periódica de los chorros.Palabras clave: Diseño de buza; simulación matemática; molde de planchón delgado tipo embudo; oscilación de los chorros; turbulencia. ABSTRACTUnderstanding the behavior of the oscillations of the jets into the mold of thin slab funnel is essential to ensure a constant supply of liquid steel, improve control of the flow patterns and consequently increase plant productivity and the final product quality. To achieve this, we conducted a study of the effect of the internal design of the nozzle on the fluid dynamics of the mold, trying to determine the origin of the oscillations of the jets. Use of mathematical and physical simulation was done to study these phenomena.For the mathematical modeling it resorts to the fundamental equations, the RSM turbulence model and VOF multiphase model. The governing equations are discretized and solved by iteration-segregated implicit method implemented in FLUENT®.The results of the mathematical simulation are showing that even for a nozzle designs with a stable operational performance, the oscillat...

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Water modelling of level fluctuation in thin slab continuous casting mould

Cited by 20 publications

References 11 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

Level Estimation in a Water Model of Continuous Casting

Simulación matemática para la optimización del patrón de flujo entregado por una buza para el molde de colada continua de planchón delgado

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