Water-model Experiment on Melting Powder Trapping by Vortex in the Continuous Casting Mold

Kasai, Norifumi; Iguchi, Manabu

doi:10.2355/isijinternational.47.982

Cited by 33 publications

(27 citation statements)

References 1 publication

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“…flow rate, the immersion depth of the pouring tube and its shape [6]. The studies have confirmed the effect of oil layer thickness and the amplitude of the wave produced in the fluid on the instability of interface behaviour; also, the cause of the formation of von Karman vortices has been established [3]. Studies that substitute steel with water and liquid slag with various oils during simulation of steel casting in the industrial mould have the drawback of failing to fully meet the criteria of similarity, as expressed with the following criterial numbers: Reynolds Number (Re), Froude Number (Fo), weber Number (we) and Capillar Number (Ca).…”

Section: Introductionmentioning

confidence: 53%

Numerical Modelling of Metal/Flux Interface in a Continuous Casting Mould / Modelowanie Numeryczne Powierzchni Międzyfazowej Metal/Ciekły Żużel W Krystalizatorze Do Ciągłego Odlewania Stali

Jowsa¹,

Bielnicki²,

Cwudziński³

2015

Archives of Metallurgy and Materials

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NumerIcal modellINg of metal/flux INterface IN a coNtINuous castINg mouldModelowanie nuMeryczne powierzchni Międzyfazowej Metal/ciekły żużel w krystalizatorze do ciągłego odlewania staliThe behaviour of liquid slag in the mould is one of the key research areas of the continuous steel casting process. Numerical simulations of steel casting in the mould equipped with submerged entry nozzle, intended for slab casting, have been carried out within the study. For modelling the behaviour of the interfaces of the liquid steel -liquid slag -air system, the VOF method was employed. In the conducted simulations, seven different procedures for the discretization of the interface of individual phases were tested. The computation results have revealed that the "entrapment" of fine slag portions into liquid steel occurs in the system under investigation; the cause of this phenomenon is explicated by the Kelvin-Helmholtz theory.Keywords: continuous casting, numerical simulation, Volume of Fluid method, interface tracking schemes, mould flux entrainment.Badania zachowania się ciekłego żużla w krystalizatorze mają istotne znaczenie dla procesu ciągłego odlewania stali. w pracy przeprowadzono symulacje numeryczne odlewania stali w krystalizatorze z wylewem zanurzeniowym, przeznaczonym do odlewania wlewków płaskich. do modelowania zachowania się granic międzyfazowych układu: ciekła stal -ciekły żużel -powietrze zastosowano metodę Volume of Fluid (VOF). Podczas prowadzonych symulacji weryfikowano siedem różnych procedur dla dyskretyzacji granicy rozdziału poszczególnych faz. wyniki obliczeń wykazały, że w badanym układzie dochodzi do "zaciągania" drobnych porcji żużla do ciekłej stali, przyczynę tego zjawiska tłumaczy teoria kelvina-Helmholtza.

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Section: Introductionmentioning

confidence: 53%

Numerical Modelling of Metal/Flux Interface in a Continuous Casting Mould / Modelowanie Numeryczne Powierzchni Międzyfazowej Metal/Ciekły Żużel W Krystalizatorze Do Ciągłego Odlewania Stali

Jowsa¹,

Bielnicki²,

Cwudziński³

2015

Archives of Metallurgy and Materials

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“…These expressions are the best fittings found so far by the various researchers [20][21][22][23][24][25][26][27][28][29][30] to their experimental results and include the physical properties of both phases such as densities, dynamic viscosities, and interfacial tensions between both phases. With the exception of Eq.…”

Section: Von Karman Vortex Formationmentioning

confidence: 86%

“…In this latter group of numbers, there are the capillary number [27] (p 1 = Ca, Table V, sets 2, 4, and 5), the ratio of dynamic viscosities l s /l m (sets 1 to 5), [28,29] the ratio of densities (sets 1 and 5), [27] and the ratio of wave height and thickness of the flux layer (sets 2, 4, and 5). [28] Set 5 of the dimensionless numbers given in Table V includes the numberp 4 , which contains a basic mold operating parameter such as the flow rate of liquid fed into the mold Q.…”

Section: Von Karman Vortex Formationmentioning

confidence: 99%

Influence of Turbulent Flows in the Nozzle on Melt Flow Within a Slab Mold and Stability of the Metal–Flux Interface

Calderon-Ramos

Morales

2016

Metall Mater Trans B

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The design of the ports of a casting nozzle has profound effects on the fluid flow patterns in slab molds. The influence of these outlets have also considerable effects on the turbulent flow and turbulence variables inside the nozzle itself. To understand the effects of nozzle design, three approaches were employed: a theoretical analysis based on the turbulent viscosity hypothesis, dimensional analysis (both analyses aided by computer fluid dynamics), and experiments using particle image velocimetry. The first approach yields a linear relation between calculated magnitudes of scalar fields of e (dissipation rate of kinetic energy) and k 2 (square of the turbulent kinetic energy), which is derived from the wall and the logarithmic-wall laws in the boundary layers. The smaller the slope of this linear relation is, the better the performance of a given nozzle is for maintaining the stability of the melt-flux interface. The second approach yields also a linear relation between flow rate of liquid metal and the cubic root of the dissipation rate of kinetic energy. In this case, the larger the slope of the linear relation is, the better the performance of a given nozzle is for maintaining the stability of the melt-flux interface. Finally, PIV measurements in a mold water model, together with equations for estimation of critical melt velocities for slag entrainment, were used to quantify the effects of nozzle design on the dynamics of the metal-slag interface. The three approaches agree in the characterization of turbulent flows in continuous casting molds using different nozzles.

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“…Vortices, which would be originated when the rotational flow exceeds a critical value, can entrain mould powder into the liquid steel. 8,12,[21][22][23] Cho et al 23) have explained the effect of nozzle clogging on flow bias and the resultant vortex formation using water model experiments. Srinivas et al 24) have investigated the interactive effects of process parameters like casting speed, degree of clogging and SEN submergence depth on vortex formation.…”

Section: Multiphase Vortex Flow Patterns In Slab Caster Mold: Experimmentioning

confidence: 99%

Multiphase Vortex Flow Patterns in Slab Caster Mold: Experimental Study

et al. 2017

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Water-model Experiment on Melting Powder Trapping by Vortex in the Continuous Casting Mold

Cited by 33 publications

References 1 publication

Numerical Modelling of Metal/Flux Interface in a Continuous Casting Mould / Modelowanie Numeryczne Powierzchni Międzyfazowej Metal/Ciekły Żużel W Krystalizatorze Do Ciągłego Odlewania Stali

Numerical Modelling of Metal/Flux Interface in a Continuous Casting Mould / Modelowanie Numeryczne Powierzchni Międzyfazowej Metal/Ciekły Żużel W Krystalizatorze Do Ciągłego Odlewania Stali

Influence of Turbulent Flows in the Nozzle on Melt Flow Within a Slab Mold and Stability of the Metal–Flux Interface

Multiphase Vortex Flow Patterns in Slab Caster Mold: Experimental Study

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