Swirling Jet Mixing of a Bath Covered With a Top Slag Layer

2007 ◽  
pp. 839-840
Author(s):  
M. Iguchi ◽  
Y. Sasaki ◽  
D. Iguchi ◽  
T. Ohmi
Keyword(s):  
Slag Layer ◽  
Jet Mixing ◽  
Swirling Jet ◽  
Top Slag

Numerical Simulation of Depleted EAF Jet Flow

2013 ◽  
Vol 444-445 ◽  
pp. 1113-1117
Author(s):  
Chong Wang ◽  
Dao Fei Zhu ◽  
Fan Han Liu ◽  
Shi Bo Wang ◽  
Hua Wang
Keyword(s):  
Cfd Simulation ◽  
Theoretical Foundation ◽  
Slag Layer ◽  
Furnace Operation ◽  
Copper Industry ◽  
Oil Consumption ◽  
Rate Reduction ◽  
Insertion Depth ◽  
Jet Mixing ◽  
Slag Cleaning

In view of the serious problems that low-rate reduction and excessive oil consumption of reducing oil guns which are used in the depleted EAF, analyzing the jet mixing process through the CFD simulation with the method of liquid level tracking, we find that the purpose of mixing slag layer, guaranteeing matte layer precipitation and saving oil can be achieved by changing combination of gas rate of mixture injected by the oil gun, jet speed and insertion depth. The results of this paper provide a theoretical foundation for optimizing reducing technical process of the slag cleaning furnace operation in a copper industry Company.

Experimental Investigation and Visualization of Helical Structures in a Novel Swirling Jet

2006 ◽  
Author(s):  
G. Regunath ◽  
V. Tesar ◽  
W. B. J. Zimmerman ◽  
B. N. Hewakandamby ◽  
N. Russell
Keyword(s):  
Mixing Layer ◽  
Helical Structures ◽  
Radial Wave ◽  
Jet Mixing ◽  
Swirling Jet ◽  
Image Velocimetry ◽  
Particle Image Velocimetry Method ◽  
Acoustic Methods ◽  
Wave Guides ◽  
Experimental Rig

This paper describes an experimental study carried out to investigate the dynamics of helical structures in an unforced swirling jet and in a forced swirling jet that is excited by acoustic methods. An experimental rig that consists of a novel swirling jet and acoustic generation chamber is utilized to study the characteristics and mutual interaction of helical structures. For the excited jet, the helical structures are acoustically triggered in the jet-mixing layer. The acoustic excitation is applied transversely by an array of eight loudspeakers using radial wave-guides. The loudspeakers are driven by harmonic acoustic signals mutually phase shifted by a quarter of the period between each two neighbors so as to act in effect to produce two rotating waves. To generate swirl in the flow, novel swirl generators are utilized. The approach is to substitute the usual vanes set at an angle relative to the incoming flow by fixed vanes at a zero angle of attack, with the flow deflection based on super-circulation produced by the Coanda effect. The particle image velocimetry method was employed to analyze, quantify and visualize the flow field.

scholarly journals Demystifying Underlying Fluid Mechanics of Gas Stirred Ladle Systems with Top Slag Layer Using Physical Modeling and Mathematical Modeling

2019 ◽  
Vol 59 (7) ◽  
pp. 1224-1233 ◽  
Author(s):  
Rodolfo D. Morales ◽  
Fabian Andres Calderon-Hurtado ◽  
Kinnor Chattopadhyay
Keyword(s):  
Mathematical Modeling ◽  
Fluid Mechanics ◽  
Physical Modeling ◽  
Slag Layer ◽  
Top Slag

Application of Swirling Jet Mixing to Cadmium Extraction from Guts of Scallop

2007 ◽  
Vol 123 (6/7) ◽  
pp. 357-362 ◽  
Author(s):  
Jin YOSHIDA ◽  
Mitsuhiro KUMAGAI ◽  
Yoshiaki UEDA ◽  
Manabu IGUCHI
Keyword(s):  
Jet Mixing ◽  
Swirling Jet

Influence of the top slag layer on the flow dynamics in AC-electric arc furnaces

2010 ◽  
Vol 2 (4) ◽  
pp. 217 ◽  
Author(s):  
M.A. Ramirez Argaez ◽  
A.N. Conejo ◽  
Y.I.C. Guzman ◽  
G. Trapaga
Keyword(s):  
Slag Layer ◽  
Electric Arc ◽  
Flow Dynamics ◽  
Electric Arc Furnaces ◽  
Arc Furnaces ◽  
Top Slag

Effect of Interfacial Tension on the Emulsification of Slag - Considerations on the CFD Modelling of Dispersion

2013 ◽  
Vol 762 ◽  
pp. 242-247 ◽  
Author(s):  
Petri Sulasalmi ◽  
Ville Valtteri Visuri ◽  
Timo Fabritius
Keyword(s):  
Interfacial Tension ◽  
Droplet Diameter ◽  
Slag Layer ◽  
Phase System ◽  
Cfd Modelling ◽  
Factors Affecting ◽  
Significant Phenomenon ◽  
Dominant Property ◽  
Computational Fluid Dynamics Cfd ◽  
Top Slag

Top slag emulsification is a significant phenomenon in refining metallurgy. During bottom-or side-blowing, the flowing steel detaches small droplets from the top slag. The interfacial energy between liquid slag and steel is one of the most important factors affecting to emulsification. Surface energy, which can be described by interfacial tension, is the dominant property when determining slag emulsification. During chemical reactions, mass transfer between the phases decreases the interfacial tension at the slag-steel interface. The change in the interfacial tension affects the droplet formation.In this paper, the effect of interfacial tension on the emulsification was studied with Computational Fluid Dynamics (CFD) modelling. Three cases were simulated by considering a 3-phase system consisting of slag, steel and gas. A small area, where a 15 mm slag layer lies on top of the liquid steel, was simulated applying three different interfacial tensions, while keeping other properties unaltered. Gas was included to enable a free slag top-surface. The droplet diameter, size distribution and amount of droplets are in the scope of interest. It was found that the Sauter mean diameter of the slag droplets increased as the interfacial tension increased. The emulsification fraction varied between 1.621.95%.

Turbulence Model Upgrades for Swirling Flows

2007 ◽  
Author(s):  
J. D. Chenoweth ◽  
B. York ◽  
A. Hosangadi
Keyword(s):  
Turbulence Model ◽  
Richardson Number ◽  
Vortex Breakdown ◽  
Azimuthal Velocity ◽  
Operating Conditions ◽  
Jet Flows ◽  
Data Sets ◽  
Mixing Rate ◽  
Jet Mixing ◽  
Swirling Jet

The ability to accurately model axisymmetric, turbulent swirling jet flows over a variety of inflow conditions is evaluated. The deficiency of the standard k-ε turbulence model in predicting mixing rates in flows with streamline curvature is well known. A relatively straightforward modification to this model is made based on a local value of the flux Richardson number which accounts for the azimuthal velocity and its variation. To evaluate the effectiveness of this modification two different experimental data sets are used to compare the computational results against. All calculations were performed using the structured, density based, CRAFT CFD® code utilizing a preconditioning methodology. Both cases have initial swirl distributions that are equivalent to a solid-body rotation profile, and have swirl numbers that are low enough to remain below the vortex breakdown regime. They also have non-swirling jet data available for the same geometries and operating conditions which allows the increased jet mixing rate of swirling jets over purely axial jets to be confirmed. All calculations showed a significant improvement of centerline velocity decay as well as downstream radial velocity profiles when the Richardson number correction was activated. For the case with turbulence data, the centerline decay of turbulent kinetic energy was also much improved. An important result that was discovered was the extreme sensitivity of the downstream evolution of the jet to the specification of the initial k and ε profiles, highlighting the critical need for a comprehensive experimental characterization of all flow properties at the jet exit.

Corrugated Limiting Tab for Supersonic Jet Mixing

2016 ◽  
Vol 9 (6) ◽  
pp. 180
Author(s):  
Anuj Bajpai ◽  
E. Rathakrishnan
Keyword(s):  
Supersonic Jet ◽  
Jet Mixing

Effects of forward flight on jet mixing noise from fine-scale turbulence

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 1261-1269 ◽  
Author(s):  
Christopher K. W. Tam ◽  
Nikolai Pastouchenko ◽  
Laurent Auriault
Keyword(s):  
Fine Scale ◽  
Forward Flight ◽  
Jet Mixing ◽  
Mixing Noise ◽  
Scale Turbulence

Momentum coupling effects in a two-phase swirling jet

1997 ◽  
Author(s):  
T. Park ◽  
S. Aggarwal ◽  
V. Katta ◽  
T. Park ◽  
S. Aggarwal ◽  
...  
Keyword(s):  
Coupling Effects ◽  
Two Phase ◽  
Swirling Jet ◽  
Momentum Coupling
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