Flow field and mixing with eccentric gas stirring

Mietz, J.; Oeters, Franz

doi:10.1002/srin.198901673

Cited by 26 publications

(24 citation statements)

References 14 publications

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“…[1][2][3][4][5][6][7][8] The meagas injection and investigated the effects. Desirable mixing conditions are realized when the RECENTLY, optimum control of mixing in current two kinds of motions occur together.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface flow control on fluid flow phenomena and mixing time in a bottom blown bath

Iguchi

Tsujino

Nakamura

et al. 1999

Metall Mater Trans B

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MANABU IGUCHI, RYOJI TSUJINO, KEI-ICHI NAKAMURA, and MITSUHIRO SANOThe intensity of mixing in a molten metal bath stirred by bottom gas injection can be represented by the mixing time. According to previous water model experiments, the mixing time is known to be dependent on the operational variables such as the bath diameter, bath depth, location of a bottom nozzle, and gas flow rate. It is not easy to control the former three variables during processing, and the dependence of the mixing time on the gas flow rate is weak. In this study, the possibility of changing the mixing time drastically due to the control of the surface flow in the bath is examined. Three kinds of boundary conditions were imposed on the bath surface, and the relation between the fluid flow phenomena resulting from the surface flow control and the mixing time was investigated. The mixing time was found to be significantly influenced by the surface flow control. In particular, when the surface flow was suppressed by bringing a circular cylinder into contact with the bath surface, the mixing time became very long. dilute aqueous KCl solution. The tracer, i.e., the aqueous versity, is with Wakayama Works, Sumitomo Metal Industries Ltd., KCl solution, was charged onto the bath surface using a Wakayama, 640-8404, Japan. MITSUHIRO SANO, Graduate Student, is small beaker. The tracer charge position was 1.0 cm away with Department of Materials Science and Processing, Osaka University, from the sidewall. The well-known 95 pct criterion was used Osaka, 565-0871, Japan.

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Section: Introductionmentioning

confidence: 99%

Effects of surface flow control on fluid flow phenomena and mixing time in a bottom blown bath

Iguchi

Tsujino

Nakamura

et al. 1999

Metall Mater Trans B

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“…Figure 1 shows a comparison between the predicted radial (r) variation of the axial (z) velocity component and the corresponding experimental measurements, 21) at mid axial plane (at z/Hϭ0.5). Predictions are made with the present model considering 'bubble slippage' (subsequently referred to as 'bubble slip' model) and also without slip (subsequently referred to as 'no slip' model) phenomena.…”

Section: Resultsmentioning

confidence: 98%

“…21) The cylindrical vessel considered for the study 21) was 0.63 m in diameter and 0.58 m in height, with bottom gas injected at a position of 2/3 R from the center of the vessel at a flow rate of 5.0ϫ10 Ϫ4 N · m 3 /s. Figure 1 shows a comparison between the predicted radial (r) variation of the axial (z) velocity component and the corresponding experimental measurements, 21) at mid axial plane (at z/Hϭ0.5).…”

Section: Resultsmentioning

confidence: 99%

Consideration of Bubble Slippage Phenomena in Numerical Modelling of Mixing in Gas Stirred Steel Ladles

Ganguly¹,

Singh²,

Chakraborty³

2006

ISIJ Int.

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“…517 and b axial variation of radial velocity component at r/R50 . 341 for off centric gas injection system, with corresponding experimental observations reported in literature26 Ganguly and Chakraborty Numerical modelling studies of flow and mixing phenomena in gas stirred steel ladlesIronmaking and Steelmaking…”

mentioning

confidence: 74%

“…26 The physical system comprised of a cylindrical water model which is agitated by air injected from bottom; the point of injection is at a position of 2R/3 from the centre of the vessel. Figure 3 shows comparison between the predicted and measured velocity components in the vessel.…”

Section: Model Validationmentioning

confidence: 99%

Numerical modelling studies of flow and mixing phenomena in gas stirred steel ladles

Ganguly¹,

Chakraborty²

2008

Ironmaking & Steelmaking

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A three-dimensional computational fluid dynamics (CFD) model was developed to simulate the fluid flow and mixing phenomena in a gas stirred ladle. Particular attention was paid to incorporate the effect of slippage between rising gas bubbles and surrounding fluid in the numerical model, to capture the relevant flow physics in a more effective manner. Various parametric studies were undertaken to examine the effects of gas flow rate, bottom nozzle configurations and tracer addition locations on mixing time. It was observed that the arrangement of bottom nozzles has a great effect on the mixing behaviour in a gas stirred ladle, with off centric gas injection producing shorter mixing time. Mixing time was found to be sensitive to the tracer addition position, particularly for the axisymmetric bottom gas injection system. The predicted results were compared with reported experimental observations and a very good agreement was observed in this regard, thereby establishing the authenticity of the proposed formulation.

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Flow field and mixing with eccentric gas stirring

Cited by 26 publications

References 14 publications

Effects of surface flow control on fluid flow phenomena and mixing time in a bottom blown bath

Effects of surface flow control on fluid flow phenomena and mixing time in a bottom blown bath

Consideration of Bubble Slippage Phenomena in Numerical Modelling of Mixing in Gas Stirred Steel Ladles

Numerical modelling studies of flow and mixing phenomena in gas stirred steel ladles

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