Journal Article10.1007/S11837-014-1023-Y
Investigation on the Fluid Flow and Mixing Phenomena in a Ruhrstahl-Heraeus (RH) Steel Degasser Using Physical Modeling
Lifeng Zhang,Fei Li +1 more
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TL;DR: In this article, the water model was established to investigate the fluid flow and mixing phenomena during the Ruhrstahl-Heraeus refining process, and the mixing time was measured by detecting the conductivity.
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Abstract: In this article, the water model was established to investigate the fluid flow and mixing phenomena during the Ruhrstahl-Heraeus refining process. The mixing time was measured by detecting the conductivity. The velocity, turbulent energy and its dissipation rate were measured using a particle-image velocimetry. There were several findings in the current study. The jet from the downleg penetrated to the bottom of the ladle, collided with the right wall of the ladle, and then went upward and sloped left to enter the upleg, generating a recirculation eddy below the upleg. The turbulent fluctuation velocities at different directions were different so that the k–e turbulent model is invalid to accurately study the fluid flow during ladle refining process. The mixing time was usually three to four times that of the recirculation time, and the mixing was different at different locations. When the mixing time is reported, the location where the mixing time is measured should be clearly mentioned. The mixing time was dependent on the stirring power by t
mix ~ e−0.42.
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Citations
Fluid Flow, Dissolution, and Mixing Phenomena in Argon-Stirred Steel Ladles
TL;DR: In this paper, the multiphase fluid flow in argon-stirred steel ladles is simulated using an Eulerian-Lagrangian two-phase approach.
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Numerical Simulation of Recirculating Flow and Physical Model of Slag–Metal Behavior in an RH Reactor: Application to Desulfurization
Johne Jesus Mol Peixoto,Weslei Viana Gabriel,Thiago Araújo Santos de Oliveira,Carlos Antônio da Silva,Itavahn Alves da Silva,Varadarajan Seshadri +5 more
TL;DR: In this article, the authors used computational fluid dynamics techniques and a 1:75 physical model of an RH degasser to evaluate the flow of gas and metal inside an RH reactor for vacuum degassing of liquid steel.
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Modeling on the Fluid Flow and Mixing Phenomena in a RH Steel Degasser with Oval Down-Leg Snorkel
Abstract: The RH vacuum refining process is vitally important for the production of ultra‐low‐carbon steels, due to its effective degassing and homogenizing. A combined physical and mathematical modeling approach is performed in the current study to investigate the multiphase fluid flow and mixing phenomena during the RH vacuum refining process. The numerical simulation coupled VOF and DPM is used to obtain the flow pattern and the interface profile in the RH reactor in the water‐air system. Turbulent characteristics are predicted by a modified k‐ϵ model. A water model is used to validate calculated results. Based on the results of RH water modeling, the 2D‐velocity distribution in the section Y = 0 is captured by particle image velocimetry (PIV) system. To improve the refining efficiency and the service life time of the RH reactor, a new designed RH degasser with an optimized down‐leg snorkel is established. The oval down‐leg snorkel with a larger cross‐sectional area will increase the circulation rate of the fluid by 20% and weaken the impact on the ladle wall compared with the traditional one, which has immense potential in future applications to improve the service life of the ladle.
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Effect of snorkel shape on the fluid flow during RH degassing process: mathematical modelling
TL;DR: In this article, a mathematical model was developed to investigate the effect of snorkel shape on the recirculation rate and the erosion of the lining refractory during RH degassing process.
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Assessment of an Eulerian multi-fluid VOF model for simulation of multiphase flow in an industrial Ruhrstahl–Heraeus degasser
TL;DR: In this paper, an Eulerian multi-fluid VOF model was applied to investigate the complex multiphase flow in an industrial Ruhrstahl-Heraeus (RH) degasser.
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Mixing Evaluation in the RH Process Using Mathematical Modelling
TL;DR: In this paper, the Navier Stokes equations along with the species concentration equation in a cartesian coordinate system comprising the geometry of the ladle and the snorkel fitted to it were used to compute the mixing time in the RH ladle under different flow conditions.
58
Fluid Flow in Ladle and Its Effect on Decarburization Rate in RH Degasser
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