Drop generation due to an impinging jet and the effect of bottom blowing in the steelmaking vessel.

Standish, N.; He, Qian

doi:10.2355/isijinternational.29.455

Cited by 56 publications

(76 citation statements)

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“…86) Figure 10 shows the droplet generation process in a transparent vessel. 143) The reasons for the droplets generation can be pressure fluctuations, horizontal and vertical cavity oscillations, 144) shearing by the gas stream, breakup of large droplets, entrainment into a gas stream, 69) and by the growth of the ripples. 145) M. Iguchi 146) exhaustively reviewed the mechanisms of the bubble and droplet generation in a bath subjected to bottom gas injection through a single-hole nozzle using many examples.…”

Section: Splashing and Droplet Generation Behaviormentioning

confidence: 99%

“…145) M. Iguchi 146) exhaustively reviewed the mechanisms of the bubble and droplet generation in a bath subjected to bottom gas injection through a single-hole nozzle using many examples. Various influential factors like lance height and flowrate, 6,67,[85][86][87][147][148][149] bottom blowing nozzles and flowrate 69,78,142,[150][151][152] were elaborately investigated to illustrate the splashing and droplet generation behavior by means of water modeling and CFD simulations. The splashing and droplet generation under different flowrate can be seen in Fig.…”

Section: Splashing and Droplet Generation Behaviormentioning

confidence: 99%

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Physical and Mathematical Modeling of Multiphase Flows in a Converter

et al. 2018

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Section: Splashing and Droplet Generation Behaviormentioning

confidence: 99%

Section: Splashing and Droplet Generation Behaviormentioning

confidence: 99%

Physical and Mathematical Modeling of Multiphase Flows in a Converter

et al. 2018

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“…Several researchers have studied aspects of droplet behavior relevant to steelmaking including, decarburization, [1][2][3][4][5][6] droplet generation, [7][8][9][10][11][12][13][14][15][16] size distribution, [17,18] and residence time. [19] Other workers have developed models [20][21][22][23] and conducted plant trials, [24][25][26][27][28] which considered the role of droplets in the overall process kinetics.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Sulfur on Dephosphorization Kinetics Between Bloated Metal Droplets and Slag Containing FeO

Dogan

Coley

2017

Metall Mater Trans B

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The bloating behavior of metal droplets and the dephosphorization behavior of bloated droplets at 1853 K (1580°C) were investigated using X-ray fluoroscopy coupled with constant volume pressure change measurements and chemical analysis of quenched samples. The effect of sulfur content on dephosphorization kinetics was studied during the decarburization period. The slag foamed during the reaction forming a foamy layer over a dense layer. After a short incubation period, the droplets became bloated due to internal decarburization. The bloated droplets floated from the dense slag into the foamy slag. The behavioral changes are directly related to the effect of sulfur on the incubation time for swelling. The dephosphorization reaction was very fast; droplets with low sulfur contents experienced phosphorus reversion shortly after entering the foamy slag, while those with higher sulfur content took a longer time to swell and went through reversion before they entered the foam. The dephosphorization rate and maximum phosphorus partition were higher at lower CO evolution rates because the dynamic interfacial oxygen potential increased with the decreasing oxygen consumption rate. The rate controlling step for dephosphorization was initially a combination of mass transport in both the metal and the slag. As the iron oxide in the slag was depleted, the rate control shifted to mass transport in slag.

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“…The analysis of contour maps of volumetric fraction showed that the computer model was able to exhibit the ways of generating droplets comparable to those observed in the physical modeling using a high speed cinematography technique (Standish and He, 1989). The results led also to observe the change in the intensity of the interaction jet / liquid pool with increasing jet speed in the computational domain.…”

Section: Discussionmentioning

confidence: 51%

“…In this figure, for the lower speed, it is noticed that a diffused region can be identified on the edge of the cavity produced by the jet, suggesting that there exists a spray of water. The presence of the spray corresponds to the way indicated in Figure 1a, the generation of droplets observed by Standish and He (1989), characteristic of moderate gas flow and/ or large heights lance. As for the higher speed, the interaction mode described by Molloy (1970) as penetration mode (Figure 1c) is observed.…”

Section: Resultsmentioning

confidence: 99%

Numerical analysis of the liquid ejection due to the gaseous jet impact through computational fluid dynamics

2018

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Metal droplets generated by an impinging jet, play an important role in metal refining processes, mainly in oxygen steelmaking, where the droplets are ejected into the slag phase. Since the available interfacial area of droplets is very high in this process, the generated droplets enhance the rates of heat transfer and chemical reactions. Therefore, knowledge of the metal droplet generation rate, size distribution and residence time in the slag are of industrial relevance. In this work, the isothermal, transient flow of an incompressible air jet impinging onto an air/water interface at room temperature has been simulated to obtain a better understanding of the droplet ejection phenomenon. The interface was tracked throughout time using the volume of fluid (VOF) technique. The governing equations formulated for mass and momentum conservation and the k-ε turbulence model are solved in the axisymmetric computational domain using the commercial code FLUENT. The droplet ejection rates calculated with computational fluid dynamics model are compared to experimental data reported in literature, showing partial agreement, being the incompressibility assumption the probable reason for the deviation observed, which was as far pronounced as the great jet velocity. Nevertheless, the model presented shows itself as a relatively good starting point for the construction of more complex ones (with less simplifying assumptions) which should be able to offer a means to increase the understanding of the droplet ejection phenomena. keywords: Numerical simulation; computational fluid dynamics; volume of fluid; top blown; droplet ejection. Hiuller Castro AraújoEngenheiro Metalurgista pela

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Drop generation due to an impinging jet and the effect of bottom blowing in the steelmaking vessel.

Cited by 56 publications

References 0 publications

Physical and Mathematical Modeling of Multiphase Flows in a Converter

Physical and Mathematical Modeling of Multiphase Flows in a Converter

The Influence of Sulfur on Dephosphorization Kinetics Between Bloated Metal Droplets and Slag Containing FeO

Numerical analysis of the liquid ejection due to the gaseous jet impact through computational fluid dynamics

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