Behavior of Top-Blown Jet under Reduced Pressure

Sumi, Ikuhiro; Okuyama, Goro; Nabeshima, Seiji; Matsuno, Hidetoshi; Kishimoto, Yasuo

doi:10.2355/isijinternational.47.73

Cited by 23 publications

(20 citation statements)

References 8 publications

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“…125) The length of the potential core is one of the significant operating parameters, which represents the attenuation rate of the supersonic flow. 64) Long potential core length can be obtained by large Mach number, 94,10) high operating pressure, 126,127) incorrect expansion, 10) high ambient pressure, 128,129) high ambient temperature, 116,130,131) etc. Longer potential core will lead to slower attenuation of the oxygen jet, which results in more intensive stirring of the molten bath in the converter.…”

Section: Supersonic Oxygen Flow Behaviormentioning

confidence: 99%

Physical and Mathematical Modeling of Multiphase Flows in a Converter

et al. 2018

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Section: Supersonic Oxygen Flow Behaviormentioning

confidence: 99%

Physical and Mathematical Modeling of Multiphase Flows in a Converter

et al. 2018

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“…[1][2][3][4][5][6][7][8][9][10][11][12] Ersson et al 1,2) employed both water-model experiments and mathematical modeling to study the effects of the top-blown jet on the steel bath in a LD converter. Also, Hirata et al 3) showed the stirring effect induced by top and side blown oxygen and bottom blown nitrogen converter.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al 9) developed a threedimensional mathematical model of multiple jets to comprehend the multi-jet coalescence and its dynamic power. Sumi et al 10) utilized both physical modeling and numerical modeling to investigate the effects of changeable ambient pressures on the top-blown jet. Besides, Sumi et al 11) studied the temperature effects on the jet behavior by the use of physical modeling.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Comparison of Two VOD Nozzle Jets

2011

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Studies of physical phenomena in a jet caused by VOD (Vacuum Oxygen Decarburization) nozzles have been carried out. The VOD process is a metallurgical process where the steel-making route is controlled under vacuum environment with oxygen top blowing. In this work, two VOD nozzle models have been employed for an investigation based on two real De Laval geometries used in industry. Numerical modeling was used to study oxygen blowing states of the nozzles at different temperatures and ambient pressures. The nozzle models were numerically computed with two dimensional domains, where vacuum conditions and temperatures were specifically defined. The modeling results showed that one of the nozzles was more applicably proper for lower pressures, displaying a more stable flow pattern. Furthermore, it was found that a change in ambient pressure has a stronger effect on the jet force than a change in ambient temperature. In addition, it was proved that the profiles of the dynamic pressure at a certain blowing distance fit well to Multi-Gaussian curves.

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“…Wei et al17 developed a three‐dimensional mathematical model for the fluid flow in an AOD converter with simple top blowing. However, a decrease in ambient pressure is able to change the behaviors of a top‐blown jet and its outlet Mach number increases with a decrease in ambient pressure,28, 29 thus making the appropriate flow pattern vary. As for mathematical modeling of the fluid flow in a VOD bath with the combined blowing, there is no report in the literature up to now.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fluid Flow in Bath during Combined Top and Bottom Blowing VOD Refining Process of Stainless Steel

Wei

Zeng

2012

steel research int.

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The fluid flow in a bath in combined top and bottom blowing vacuum‐oxygen decarburization (VOD) refining process of stainless steel has numerically been simulated. The three‐dimensional mathematical model used is essentially based on that proposed in our previous work for the flow in combined side and top blowing argon‐oxygen decarburization (AOD) process, but considering the influence of reduced ambient pressure. Applying it to the flow in the bath of a 120 t VOD vessel under the refining conditions, the results present that the model can fairly well simulate and estimate the flow phenomena. The flow pattern of molten steel in the bath with the combined blowing is a composite result under the common action of the jets from a three‐hole Laval top lance and gas bottom blowing streams. The jets have a leading role on it; the molten steel in the whole bath is in vigorous stirring and circulatory motion during the blowing process. The streams do not alter the basic features of the gas agitation and liquid flow, but can evidently change the local flow pattern of the liquid and increase its turbulent kinetic energy to a certain extent. The flow field and turbulent kinetic energy distribution in the combined blowing with three tuyeres are more uniform than those in the blowing with double tuyeres. Increasing properly the tuyere eccentricities is of advantage for improving the velocity and turbulent kinetic energy distributions, the stirring and mixing result in the practical VOD refining process.

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Behavior of Top-Blown Jet under Reduced Pressure

Cited by 23 publications

References 8 publications

Physical and Mathematical Modeling of Multiphase Flows in a Converter

Physical and Mathematical Modeling of Multiphase Flows in a Converter

Mathematical Comparison of Two VOD Nozzle Jets

Numerical Simulation of Fluid Flow in Bath during Combined Top and Bottom Blowing VOD Refining Process of Stainless Steel

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