Modelling of gas injection into a viscous liquid through a top-submerged lance

摘要

The hydrodynamics of a gas-viscous liquid flow is numerically studied by coupling the Volume of Fluid (VOF) method with the Renormalization Group (RNG) k e model or Large Eddy Simulation (LES) (VOFRNG or VOF-LES). The simulations are validated by Particle Imaging Velocimetry (PIV) measurements. Averaged flow features are predicted by 2D and 3D VOF-RNG/LES models. Only the 3D VOF-LES model predicts the velocity fluctuation well. The Dynamic Smagorinsky-Lilly (DSL) Subgrid-scale model slightly outperforms the Wall-Adapting Local Eddy-Viscosity (WALE) subgrid-scale model. Subsequently, flow characteristics of a gas-viscous liquid flow are studied by the validated 3D VOF-LES-DSL model under industrially relevant conditions. Gas penetration depth, flow velocity attenuation, surface sloshing and slag splashing are quantitatively described. The flow regime is identified through the pressure data monitored in the lance and its Fast Fourier Transform (FFT) results. The study of the coherent structures shows strong vortices in the top part of the slag pot. (C) 2019 Elsevier Ltd. All rights reserved.