Numerical Simulation of Fluid Flow and Thermal Characteristics of Thin Slab in the Funnel-Type Molds of Two Casters

Liu, Heping; Yang, C.H.; Zhang, Hui; Zhai, Qijie; Gan, Yong

doi:10.2355/isijinternational.51.392

Cited by 54 publications

(33 citation statements)

References 32 publications

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“…SEN design is another aspect that can be resolved through this kind of models. 72) Solidification progress also changes the flow pattern inside the cavity in an effective ways through thermal buoyancy. 37,84) The effect of thermal buoyancy is obvious in the sub-mold zone but it also becomes an important factor even in the regions of strong forced convection near liquidus temperature as it induces a turbulence flow.…”

Section: Shell Growth Through Solidificationmentioning

confidence: 99%

Thermo-fluid Mathematical Modeling of Steel Slab Caster: Progress in 21st Century

Singh

Das

2016

ISIJ Int.

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Interaction of solidified shell and fluid flow inside the mold cavity governs the quality in the continuous slab casting of steel. A careful mathematical model can reveal the phenomena at play to take corrective action for better quality and productivity of the caster. These phenomena include turbulent flow in the nozzle and mold, heat transfer and solidification, the transport of bubbles and inclusion particles, multiphase flow phenomena, the effect of electromagnetic forces, interfacial phenomena, interactions between the steel surface and the slag layers, the transport of solute elements and segregation etc. Substantial development has been done across the world in this direction during past few years. This paper reviews recent progress in modeling the thermo-fluid aspect of a steel caster.

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Section: Shell Growth Through Solidificationmentioning

confidence: 99%

Thermo-fluid Mathematical Modeling of Steel Slab Caster: Progress in 21st Century

Singh

Das

2016

ISIJ Int.

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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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“…2 In the thin slab casting process, high casting extraction speed may cause high metal/slag interface turbulence, resulting in mould powder entrapment. [2][3][4][5] The defect caused by the entrapment of the mould powder is one of the problems in steel products produced by the process. Many investigations have been carried out on the mechanism of mould powder entrapment in the conventional slab casting process.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanism of mould powder entrapment in funnel type mould of flexible thin slab casting machine

Zheng

Zhu

2013

Ironmaking & Steelmaking

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A physical model was established to study the mechanism of mould powder entrapment in the funnel type mould of a flexible thin slab casting machine, and the effects of operational parameters on the powder entrapment were investigated. The results show that there are three mechanisms of mould powder entrapment, vis-à -vis entrapment caused by shear stress, entrapment caused by vortex and entrapment caused by shear stress and vortex. Three different modes of the entrapment caused by the shear stress, between the mould powder and the molten steel flow produced by the flow from the upper ports of a four-port submerged entry nozzle, were observed. The entrapment caused by vortex occurs at the lowest position of the metal/slag interface. The entrapment caused by shear stress and vortex is a new mechanism, in which the powder is firstly drawn downward by shear stress and then pulls the powder layers above under the common action of shear stress and vortex.

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Numerical Simulation of Fluid Flow and Thermal Characteristics of Thin Slab in the Funnel-Type Molds of Two Casters

Cited by 54 publications

References 32 publications

Thermo-fluid Mathematical Modeling of Steel Slab Caster: Progress in 21st Century

Thermo-fluid Mathematical Modeling of Steel Slab Caster: Progress in 21st Century

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

Study on mechanism of mould powder entrapment in funnel type mould of flexible thin slab casting machine

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