Vortex characteristics due to nozzle clogging in water caster mould: modelling and validation

Srinivas, Peri Subrahmanya; Mishra, Deepak Kumar; Gupta, Raghvendra; Korath, Jose Martin; Jana, Amiya K.

doi:10.1080/00084433.2018.1560662

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…Lawson and Davidson (2001) and Lawson et al (2005) reported PIV and LDA experiments on a similar setup. Besides an inherent instability of the flow, asymmetries can be triggered by clogging of the SEN (Srinivas et al, 2019) and also the bended geometry of the mold downward of the pure liquid zone might have an influence on the flow symmetry (Liu and Li, 2018). Consequently, if there is a net horizontal mean flow around the SEN caused by such asymmetries, vortices will occasionally form on the leeward side of the nozzle that possibly entrain slag into the mold (Pirker, 2010).…”

Section: Technical Background and Applicationmentioning

confidence: 99%

Time-resolved PIV measurements of a deflected submerged jet interacting with liquid-gas and liquid-liquid interfaces

Puttinger

Saeedipour

2021

Exp. Comput. Multiph. Flow

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This paper presents an experimental investigation on the interactions of a deflected submerged jet into a liquid pool with its above interface in the absence and presence of an additional lighter liquid. Whereas the former is a free surface flow, the latter mimics a situation of two stratified liquids where the liquid-liquid interface is disturbed by large-scale motions in the liquid pool. Such configurations are encountered in various industrial applications and, in most cases, it is of major interest to avoid the entrainment of droplets from the lighter liquid into the main flow. Therefore, it is important to understand the fluid dynamics in such configurations and to analyze the differences between the cases with and without the additional liquid layer. To study this problem, we applied time-resolved particle image velocimetry experiments with high spatial resolution. A detailed data analysis of a small layer beneath the interface shows that although the presence of an additional liquid layer stabilizes the oscillations of the submerged jet significantly, the amount of kinetic energy, enstrophy, and velocity fluctuations concentrated in the proximity of the interface is higher when the oil layer is present. In addition, we analyze the energy distribution across the eigenmodes of a proper orthogonal distribution and the distribution of strain and vortex dominated regions. As the main objective of this study, these high-resolution time-resolved experimental data provide a validation platform for the development of new models in the context of the volume of fluid-based large eddy simulation of turbulent two-phase flows.

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Section: Technical Background and Applicationmentioning

confidence: 99%

Time-resolved PIV measurements of a deflected submerged jet interacting with liquid-gas and liquid-liquid interfaces

Puttinger

Saeedipour

2021

Exp. Comput. Multiph. Flow

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“…The SEN clogging could also affect the flow pattern in the mold. It was reported through numerical simulations [3][4][5][6] that the nozzle clogging would break the symmetry of the flow field in the mold by increasing the jet stream velocity magnitude on the side with weaker clogging, leading to the higher velocity and level fluctuation at the steel-slag interface as well as the increment of the occurrence frequency, top-diameter, rotational speed, and penetration depth of vortices. The asymmetrical fluid flow pattern in the mold caused by the SEN one-sided clogging could also generate an asymmetrical temperature distribution in the mold and increase the risk of breakouts [4] .…”

Section: Introductionmentioning

confidence: 99%

Formation and Prevention of Nozzle Clogging during the Continuous Casting of Steels: A Review

Yang,

Zhang,

Ren

et al. 2024

ISIJ Int.

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Nozzle clogging is a common phenomenon in the continuous casting of steels, especially for aluminum killed steels, and has detrimental effects on the continuity of casting and the steel cleanliness. The formation and prevention of nozzle clogging during the continuous casting of steels was reviewed in the current study. The characterization of nozzle clogging was firstly summarized, finding that the composition, morphology, and structure of the nozzle clogging significantly depended on the steel grade, casting condition, and clogging degree. Then three factors affecting the formation of nozzle clogging was briefly summarized as the physical adhesion of high-melting-point inclusions, the temperature drop resulted from the insufficient preheating of nozzles and the temperature fluctuation of molten steel, and the chemical reactions occur during the continuous casting. The prevention methods of nozzle clogging could be roughly divided into 5 types, including the cleanliness improvement of steel, the liquid modification of inclusions, the fluid flow control inside the nozzle, the coating treatment on the inner surface of nozzles, and the external field treatment.Moreover, the challenge of the nozzle clogging control in the future was proposed. Multiple methods should be coordinated, especially the external field treatment should be developed to achieve a better inhibitory effect on the nozzle clogging.

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“…As for the numerical simulation of SEN clogging, most works studied the changes in the flow field and slag layer in the mold after SEN clogging to a certain extent by directly changing the nozzle structure. Srinivas [16] used numerical simulation to study the change in eddy current in the mold under different degrees of clogging by changing one side hole geometric structure of the SEN. It is indicated that the eddy current increases with the increase in the degree of SEN clogging.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Transient Submerged Entry Nozzle Clogging and Its Effect on Flow Field, Bubble Distribution and Interface Fluctuation in Slab Continuous Casting Mold

Li,

He,

Zhao

et al. 2024

Metals

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Submerged entry nozzle (SEN) clogging will affect the production efficiency and product quality in the continuous casting process. In this work, the transient SEN clogging model is developed by coupling the porous media model defined by the user-defined function (UDF) and the discrete phase model (DPM). The effects of the transient SEN clogging process on the flow field, the distribution of argon gas bubbles and the fluctuation of the interface between steel and slag in the concave bottom SEN in the continuous casting slab mold with a cross-section of 1500 mm × 230 mm are studied by coupling transient SEN clogging model, DPM and volume of fluid (VOF) model. The results show that the actual morphology and thicknesses of SEN clogging are in good agreement with the numerical simulation results. The measurement result of the surface velocity is consistent with the numerical simulation result. With increasing the simulation time, the degree of SEN clogging increases. The flow velocities of molten steel flowing from the outlet of the side hole increase, because the flow space is occupied with the clogging inclusions, which leads to the increased number of argon gas bubbles near the narrow wall. The steel–slag interface fluctuation near the narrow walls also increases, resulting in the increased risk of slag entrapment.

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Vortex characteristics due to nozzle clogging in water caster mould: modelling and validation

Cited by 8 publications

References 12 publications

Time-resolved PIV measurements of a deflected submerged jet interacting with liquid-gas and liquid-liquid interfaces

Time-resolved PIV measurements of a deflected submerged jet interacting with liquid-gas and liquid-liquid interfaces

Formation and Prevention of Nozzle Clogging during the Continuous Casting of Steels: A Review

Mathematical Modeling of Transient Submerged Entry Nozzle Clogging and Its Effect on Flow Field, Bubble Distribution and Interface Fluctuation in Slab Continuous Casting Mold

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