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

Xu, Mianguang; Zhu, Miaoyong

doi:10.2355/isijinternational.55.791

Cited by 36 publications

(29 citation statements)

References 22 publications

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“…In the past, many studies have been carried out in order to understand the steel flows in SENs under various conditions and to further improve the bulk flow pattern in the mold. Specifically, the effects of the nozzle type (straight or bifurcated), [1,2] SEN port design (number, shape, angle, thickness), [3][4][5][6][7][8][9][10][11][12][13] argon injection in SENs, [5,[15][16][17][18][19][20][21] SEN immersion depth, [6,13] slide gate position, [5] and nozzle clogging [17,22] on the steel flows have been investigated. These studies improved the understanding of the steel flow characteristics in SENs which contributed to the steel flow optimization.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Wang

Jonsson

et al. 2017

Metall Mater Trans B

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A new tundish design was investigated using both water model experiments and numerical simulations. The results show that the Reynolds Stress Model simulation results agree well with the Particle Image Velocimetry-measured results for water model experiments. A strong swirling flow in the Submerged Entry Nozzle (SEN) of the new tundish was successfully obtained, and the tangential velocity in the region near SEN inlet could reach a value of around 3.1 m/s. A high value of the shear stress was found to exist on the SEN wall, due to the strong swirling flow inside the SEN. This large shear stress leads to the dissipation of the rotational momentum of the steel flow. Thus, the maximum tangential velocity of the steel flow decreases from 3.1 m/s at around the SEN inlet to 2.2 m/s at a location close to the SEN outlet. In addition, the near-wall region has a high pressure, which is larger than the atmospheric pressure, due to the centrifugal effect. The calculated swirl number, with the value of around 1.6 at SEN inlet, illustrates that the current design can produce a similar strong swirling flow compared to the swirl blade method and the electromagnetic stirring method, while this is obtained by simply changing the steel flow path in tundish instead of using additional device to influence the flow.

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Section: Introductionmentioning

confidence: 99%

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Wang

Jonsson

et al. 2017

Metall Mater Trans B

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“…É importante ressaltar ainda que o impacto do fluxo de aço sobre a pele sólida nas regiões do filete e do centro do flange retarda o crescimento da pele nessas regiões. Este efeito na região central do flange, também foi observado por Xu e Zhu [8], que o denominaram "washing effect". Os valores da profundidade de penetração do jato, obtidos por simulação matemática, estão apresentados na Tabela 1.…”

Section: Caracterização Do Jatounclassified

“…Houve substancial coerência entre os resultados obtidos, com aqueles disponíveis na literatura acerca da flutuação do menisco. Por simulação matemática, Xu e Zhu [8] observaram que para válvulas tubulares, o nível de flutuação do menisco mostrou-se menor que 1mm; enquanto que Zhang et al [11], via modelamento físico, obtiveram uma flutuação média da ordem de 0,2mm para SEN de 40mm de diâmetro interno e 70mm de profundidade de imersão. Já Chen et al [10], obtiveram, por simulação matemática, uma flutuação de oscilação da ordem de 0,8mm na região da alma e 2,2mm na do flange, para imersão de 75mm.…”

Section: Caracterização Do Jatounclassified

“…A geometria do bocal da(s) válvulas submersa(s) influencia o campo de velocidades e a dissipação de calor na região do molde. Neste contexto, Xu e Zhu [8] compararam o uso de válvulas tubulares simples e válvulas dotadas de três furos laterais na saída, dois apontados para o flange e um para a região central da alma. Os resultados mostraram que para válvulas tubulares, o perfil de temperatura é tal que a pele solidificada é mais fina na região do filete e mais espessa na alma; enquanto que para as válvulas com três furos laterais, ocorreu uma maior oscilação do menisco, porém o encontro dos jatos na região central da alma cria uma zona de alta temperatura, o que gera uma pele mais fina, e, por isso, propensa a rupturas.…”

Section: Introductionunclassified

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Comportamento Do Jato De Aço E Análise Das Flutuações Superficiais Em Um Molde De Beam Blank

Peixoto¹,

Gabriel²,

Silva³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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ResumoA complexidade do formato do molde de beam blank aumenta a importância de se compreender o comportamento do fluxo no interior do mesmo. Neste estudo verificou-se a influência da profundidade de imersão e da velocidade de lingotamento sobre as características de fluxo em um molde de beam blank alimentado por duas válvulas tubulares. Os resultados das simulações matemáticas foram coerentes com os resultados do modelamento físico. A velocidade de espalhamento do jato na região do flange é maior que na alma e este fator pode acarretar na solidificação irregular da pele ao longo da seção transversal. A profundidade de penetração do jato variou entre 66cm e 77cm. A intensidade média de flutuação do menisco foi de 0,22mm, sendo a flutuação máxima encontrada de 0,85mm. Com base nos resultados obtidos, os parâmetros de operação sugeridos são: profundidade de imersão igual a 75mm e velocidade de lingotamento máxima de 1m/min. Palavras-chave: Beam Blank; Fluxo; PIV; PLIF. BEHAVIOUR OF STEEL JET AND ANALYSIS OF SURFACE FLUCTUATIONS IN A BEAM BLANK MOLD AbstractThe complexity of the beam blank mold geometry increases the importance of assessing the flow behavior inside the mold. This work is related to the influence of the immersion depth and the casting speed on the flow characteristics in a beam blank mold fed with two tubular nozzles. There was found a good agreement between the results obtained from physical modeling and CFD modeling. The liquid jet spreads itself faster at the flange region than at the web and this factor can lead to an non uniform shell thickness along the cross section. The jet penetration depth ranged between 66cm and 77cm. The average intensity of meniscus fluctuation was 0.22mm, and the maximum fluctuation was 0.85mm. Based on modeling results the suggested operating parameters are: SEN immersion of 75mm and maximum casting speed of 1m/min.

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“…Most defects affecting steel quality in the continuous casting (CC) process are associated with metallurgical behavior in the mold, which is largely determined by the submerged entry nozzle (SEN). The SEN can affect the flow pattern, solidified shell growth, free surface status and inclusion removal in the CC mold [1,2]. Previous works have developed both experimental and numerical models for analyzing the flow [3][4][5] and initial solidification [6][7][8] in the CC mold under different SEN conditions.…”

Section: Introductionmentioning

confidence: 99%

The Effects of a Submerged Entry Nozzle on Flow and Initial Solidification in a Continuous Casting Bloom Mold with Electromagnetic Stirring

Fang

Zhang

et al. 2017

Metals

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Abstract:The melt flow, level fluctuation, temperature field, and solidification behavior coupled with electromagnetic stirring (EMS) effects in the continuous casting mold region of U71Mn steel bloom were numerically analyzed by commercial computational fluid dynamics (CFD) software named ANSYS FLUENT. The effects of submerged entry nozzle (SEN) structures and the installation methods for optimized four-port SEN on the flow pattern, level fluctuation, heat transfer and initial solidification behavior in a bloom mold loaded with EMS were investigated. The aim is to propose a better SEN condition for the big bloom casting of high railway steel. The water simulation experiments were conducted to show the flow characteristics under different SEN conditions and verify the numerical model of flow pattern. The experimental and numerical simulation results showed that the optimized four-port SEN with diagonal installation cannot only improve the flow pattern of the molten steel by alleviating the level fluctuation and reducing the impact pressure to the wall. It is also beneficial for temperature variation at both bloom surface and corner, as well as the local solidified shell thinning phenomena due to the elimination of impingement effect.

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

Cited by 36 publications

References 22 publications

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Numerical and Physical Study on a Cylindrical Tundish Design to Produce a Swirling Flow in the SEN During Continuous Casting of Steel

Comportamento Do Jato De Aço E Análise Das Flutuações Superficiais Em Um Molde De Beam Blank

The Effects of a Submerged Entry Nozzle on Flow and Initial Solidification in a Continuous Casting Bloom Mold with Electromagnetic Stirring

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