University of Oulu

Ramasetti, E. K., Visuri, V-V., Sulasalmi, P., Kärnä, A., Fabritius, T. (2017) Numerical study of multiphase flows in a ladle for different closure models. In Proceedings of the 11th Pacific Symposium on Flow Visualization and Image Processing, Kumamoto, Japan, 1-3 December 2017, PSFVIP11-019

Numerical study of multiphase flows in a ladle for different closure models

Saved in:
Author: Ramasetti, Eshwar Kumar1; Visuri, Ville-Valtteri1; Sulasalmi, Petri1;
Organizations: 1Process Metallurgy Research Unit, University of Oulu PO Box 4300, 90014 University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019082225151
Language: English
Published: Kumamoto University , 2017
Publish Date: 2019-08-22
Description:

Abstract

Computational Fluid Dynamics (CFD) modelling is increasingly being used for studying various metallurgical processes. In secondary steelmaking, gas stirring is used in ladles to enhance the mixing of the steel. This work aims at numerical study to investigate the effect of different closure models on of the flow analysis in a two-phase gas-stirred ladle. The study represents a cylindrical geometry, in which liquid Wood’s metal represents the liquid metal phase and nitrogen gas is injected through nozzle located centrically or eccentrically at the bottom of the vessel. Three-dimensional CFD simulations were carried out using the commercial software package ANSYS FLUENT using Euler-Euler multi-phase model. To study the influence of turbulence models on the accuracy of the CFD analysis, three different models Standard k-ε, k-ω and Reynolds Stress Model (RSM) were employed. Furthermore, four different gas flow rates (100, 200, 500 and 800 cm3/s) were used for studying the effect of gas flow rates on the flow velocities. The simulation results were compared with the available experimental data of the liquid velocity profiles, volume fraction of gas and turbulent kinetic energy at different heights in the ladle. The RSM model showed a good accuracy of results when compared to experimental results, but it requires more computational time when compared to other turbulence models. The simulation results using the liquid Wood’s metal/nitrogen system were compared to water/air and liquid steel/argon systems to check the effect of material properties on the flow velocities in the ladle. The results provide useful guidelines for numerical modelling of fluid flows in steelmaking ladles and suggest that the RSM turbulence model is better suited for studying gas injection in metallurgical ladles than k-ε or k-ω models.

see all

Article number: PSFVIP11-019
Host publication: Proceedings of the 11th Pacific Symposium on Flow Visualization and Image Processing
Conference: Pacific Symposium on Flow Visualization and Image Processing
Type of Publication: D3 Professional conference proceedings
Field of Science: 215 Chemical engineering
Subjects:
Funding: The research work was financially supported by the European Union under Marie Sklodowska-Curie Horizon 2020 project, which is gratefully acknowledged.
Copyright information: © 2017 The Author(s).