Influence of Aspect Ratio on Fluid Flow and Heat Transfer in Mould when Using Swirl Flow during Casting

Kholmatov, Shakvat; Takagi, Shigeo; Jönsson, Pär G.; Jonsson, Lage; Yokoya, Shinichiro

doi:10.1002/srin.200806186

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…This study was the first to try to investigate the influence of such swirling flow tundish design on the steel flow, heat transfer, inclusion motion, and steel/slag interface stability in the mold. Previously, the effect of a swirling flow SEN on the steel flow in molds has been studied [34,38,[40][41][42]46]. However, issues such as the steel/slag interface fluctuation, steel velocity in the vicinity of the solidified shell, and the field properties in the deep mold, are still not well investigated.…”

Section: Concluding Discussionmentioning

confidence: 99%

“…This is realized by using a swirling flow SEN, which aims to produce a rotational flow component to optimize the SEN port flows, and afterwards, optimize the steel flow in a mold. The swirling flow SEN and its influence on the mold flow have been vastly studied [34][35][36][37][38][39][40][41][42][43][44][45][46]. It was found that the heat and mass transfer near the meniscus can be remarkably activated [34,38,40,42], and a uniform velocity distribution can be obtained within a short distance from the SEN outlet [34,38,40].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Ersson

Jonsson

et al. 2018

Metals

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The effect of a new cylindrical swirling flow tundish design on the multiphase flow and heat transfer in a mold was studied. The RSM (Reynolds stress model) and the VOF (volume of fluid) model were used to solve the steel and slag flow phenomena. The effect of the swirling flow tundish design on the temperature distribution and inclusion motion was also studied. The results show that the new tundish design significantly changed the flow behavior in the mold, compared to a conventional tundish casting. Specifically, the deep impingement jet from the SEN (Submerged Entry Nozzle) outlet disappeared in the mold, and steel with a high temperature moved towards the solidified shell due to the swirling flow effect. Steel flow velocity in the top of the mold was increased. A large velocity in the vicinity of the solidified shell was obtained. Furthermore, the risk of the slag entrainment in the mold was also estimated. With the swirling flow tundish casting, the temperature distribution became more uniform, and the dissipation of the steel superheat was accelerated. In addition, inclusion trajectories in the mold also changed, which tend to stay at the top of the mold for a time. A future study is still required to further optimize the steel flow in mold.

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Section: Concluding Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Ersson

Jonsson

et al. 2018

Metals

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“…The swirling flow generated in the SEN has been proposed as an effective manner to control the flow pattern in the mold, especially at the mold meniscus, which benefits the heat and mass transfers during casting . Sun and Zhang reported that the center porosity, center radial crack, and macrosegregation of the slab were reduced using the devices generating swirling flow in the SEN.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Effect of a Novel Swirling Flow Generator for Submerged Entry Nozzle in Tundish

Yan

Yang

et al. 2020

steel research int.

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The swirling flow in the submerged entry nozzle (SEN) is found to significantly improve the flow pattern in the mold, as well as the quality of the steel products. However, the devices generating swirling flow designed so far are mostly limited to be applied in the industries due to the cost, lifetime, external facility, and so on. Herein, a novel swirling flow generator (SFG) is intended to be installed in the conventional tundish to generate a swirling flow in the SEN driven by the gravitational potential energy of the molten steel. The computational fluid dynamics (CFD) simulations are performed to investigate the effects of the SFG by comparing the flow pattern in the conventional tundish. The result shows that a swirling flow is produced in the SEN without bringing a serious disturbance to the flow distribution in the tundish. The flow in the SEN becomes much even by adopting the SFG and the swirling velocity is found to decrease with the increasing distance from the bottom of the tundish. A parameter called swirling intensity is proposed to quantitatively evaluate the intensity of the swirling in the SEN.

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“…Specifically, Yokoya et al [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] investigated the use of the swirl blade to produce a swirling flow inside SEN. This is a method by installing a swirl blade inside a SEN to produce a swirling flow.…”

Section: Introductionmentioning

confidence: 99%

Application of a Swirling Flow Producer in a Conventional Tundish during Continuous Casting of Steel

Jonsson

Ersson

et al. 2017

ISIJ Int.

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A swirling flow producer was designed for a conventional tundish in order to produce a swirling flow in the SEN driven by the steel flow potential. CFD simulations were carried out to investigate the flow phenomena in the new tundish system. The results show that a swirling flow in the tundish SEN was successfully obtained. The swirl number of the obtained steel flow inside the SEN can reach a value of 1.34, with a tangential velocity of around 2.8 m/s. The possibility of slag entrainment at the top of the tundish was estimated by analyzing the steel flow characteristics near the top surface. The calculated Weber Number is around 0.3 outside the cylinder, which indicates a low possibility of slag entrainment. A high value of shear stress was found on the SEN wall. This is due to the rotational steel flow in SEN. Also, non-metallic inclusions were tracked in the fully developed steel flow field. It was found that the number of inclusions that touch the top surface increases with an increased inclusion size. Small size inclusions mainly move into the cylinder from the left side of tangential inlet. Therefore, methods like installing a dam at the tundish bottom may be helpful to change the inclusion trajectories to move towards the top of the tundish.

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Influence of Aspect Ratio on Fluid Flow and Heat Transfer in Mould when Using Swirl Flow during Casting

Cited by 4 publications

References 10 publications

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Numerical Study on the Effect of a Novel Swirling Flow Generator for Submerged Entry Nozzle in Tundish

Application of a Swirling Flow Producer in a Conventional Tundish during Continuous Casting of Steel

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