Hydrodynamics study of bubbly flow in a top-submerged lance vessel

Wang, Yannan; Vanierschot, Maarten; Cao, Lingling; Cheng, Zhiheng; Blanpain, Bart; Guo, Muxing

doi:10.1016/j.ces.2018.08.045

Cited by 28 publications

(16 citation statements)

References 38 publications

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“…Their simulations were performed on air-water and air-glycerol systems to qualitatively understand the effect of viscosity on the multiphase flow field. A recent work was published by Wang et al, [18] who investigated the usage of the appropriate turbulence model, using a Volume of Fluid approach. The results were compared with experimental data obtained from a setup with air injection in paraffin oil, using a vessel of 0.135 9 0.135 9 0.195 m. They found that the Renormalization Group k model (RNG) and the Reynolds Stress Model (RSM) are able to predict time-averaged velocity fields.…”

Section: Introductionmentioning

confidence: 99%

The Importance of Viscous and Interfacial Forces in the Hydrodynamics of the Top-Submerged-Lance Furnace

Obiso

Kriebitzsch

Reuter

et al. 2019

Metall Mater Trans B

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The purpose of this work is to focus on the hydrodynamics of a Top-Submerged-Lance (TSL) smelting furnace, understanding how liquid properties and operational parameters act on key factors of a TSL process, such as splashing, mixing, mass transfer area, and bubble development. A deep knowledge of all those aspects is needed since they all influence the smelting reaction rates; hence the efficiency of the reactor. The characterization and scaling of the TSL gas injection are commonly based on the modified Froude number, the ratio of dynamic and gravitational forces. Detailed literature research reveals a potential weakness of this approach, since it does not consider the effects of viscosity and surface tension. To investigate this question an extensive parametric study was performed applying computational fluid dynamics to cold and non-reactive flows, which provided a broad overview of the physics of the flow. The analysis was performed on fluid dynamic properties (liquid density, liquid viscosity, surface tension) and operational variables (gas volume flow, lance immersion depth). The coupled Level Set-Volume of Fluid model, available in the commercial solver ANSYS Fluent Ò , was used to resolve the gas-liquid interface in the multiphase flow. The results of the work underscore the significance of the viscous and interfacial forces for gas injection in smelting slags, confirming the incompleteness of applying only the Froude number to describe such flows.

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Section: Introductionmentioning

confidence: 99%

The Importance of Viscous and Interfacial Forces in the Hydrodynamics of the Top-Submerged-Lance Furnace

Obiso

Kriebitzsch

Reuter

et al. 2019

Metall Mater Trans B

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“…Wang et al [19] studied the flow characteristics in the system of gas injection into liquid through a top-submerged lance. The volume of fluid (VOF) multiphase model coupled with three turbulence models, renormalization-group (RNG), Reynolds stress model (RSM) and large eddy simulation (LES), have been considered and particle image velocimetry (PIV) experimental data was measured to verify the simulated results.…”

Section: Of 13mentioning

confidence: 99%

An Experimental and Simulated Study on Gas-Liquid Flow and Mixing Behavior in an ISASMELT Furnace

Zhao

Yin

et al. 2019

Metals

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In this study, a water-model experiment and numerical simulation were carried out in a pilot ISASMELT furnace to study the factors affecting mixing time. The experimental results were compared to the simulation results to test the accuracy of the latter. To study the internal factors that affect the mixing time, the turbulent viscosity and flow field were calculated using simulation. In addition, following previous research, external factors that influence the mixing time including the depth of the submerged lance, lance diameter, gas flow rate, and the presence of a swirler were studied to investigate their effect on the flow regime. The results indicated that the mixing time is controlled by the turbulent viscosity and velocity vector. In addition, it was found that the lance diameter should not exceed 3.55 cm to maintain sufficient energy for stirring the bath. Finally, the optimal gas flow rate that offers the best mixing efficiency was found to be 50 Nm3/h.

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“…Due to difficulties of high temperature experiments (e.g., opacity of a slag pot, hazardous operating environment, lack of velocity measuring techniques at high temperature), physical modelling (Igwe et al, 1973;Mazumdar and Guthrie, 1985;Iguchi et al, 1994;Morsi et al, 2000;Zhao et al, 2016Zhao et al, , 2017Pan and Langberg, 2010) and numerical simulation (Mazumdar and Guthrie, 1985;Liovic et al, 2002;Huda et al, 2010Huda et al, , 2012Wang et al, 2018;Sattar et al, 2014;Obiso et al, 2019) have been performed on a top injection two-phase flow in a metallurgical vessel. Iguchi et al (1994) performed some cold model experiments to analyze the fluid flow initiated by the top submerged gas injection in a cylindrical bath.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the submerged lance depth could increase the fuming rate. In order to compare the calculation results of using different turbulence model on a top submerged gas injection into a high viscosity liquid, the present authors (Wang et al, 2018) performed 2D and 3D simulations with a combined VOF-RNG/RSM/LES model. The simulation was elaborately validated by PIV experiments in an airparaffin oil two-phase system.…”

Section: Introductionmentioning

confidence: 99%