Numerical Simulation of Multiphase Magnetohydrodynamic Flow and Deformation of Electrolyte–Metal Interface in Aluminum Electrolysis Cells
| Autor: | Jinsong Hua, Magne Rudshaug, Robert Jorgensen, Nils-Haavard Giskeodegard, Christian Droste |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Computer simulation Turbulence Metals and Alloys 02 engineering and technology Mechanics Deformation (meteorology) Condensed Matter Physics 01 natural sciences Cathode 020501 mining & metallurgy 010305 fluids & plasmas law.invention Anode Physics::Fluid Dynamics 0205 materials engineering Mechanics of Materials law 0103 physical sciences Materials Chemistry Fluid dynamics Magnetohydrodynamic drive Current (fluid) |
| Zdroj: | Metallurgical and materials transactions. B, process metallurgy and materials processing science |
| ISSN: | 1543-1916 1073-5615 |
| Popis: | A computational fluid dynamics based multiphase magnetohydrodynamic (MHD) flow model for simulating the melt flow and bath–metal interface deformation in realistic aluminum reduction cells is presented. The model accounts for the complex physics of the MHD problem in aluminum reduction cells by coupling two immiscible fluids, electromagnetic field, Lorentz force, flow turbulence, and complex cell geometry with large length scale. Especially, the deformation of bath–metal interface is tracked directly in the simulation, and the condition of constant anode–cathode distance (ACD) is maintained by moving anode bottom dynamically with the deforming bath–metal interface. The metal pad deformation and melt flow predicted by the current model are compared to the predictions using a simplified model where the bath–metal interface is assumed flat. The effects of the induced electric current due to fluid flow and the magnetic field due to the interior cell current on the metal pad deformation and melt flow are investigated. The presented model extends the conventional simplified box model by including detailed cell geometry such as the ledge profile and all channels (side, central, and cross-channels). The simulations show the model sensitivity to different side ledge profiles and the cross-channel width by comparing the predicted melt flow and metal pad heaving. In addition, the model dependencies upon the reduction cell operation conditions such as ACD, current distribution on cathode surface and open/closed channel top, are discussed. |
| Databáze: | OpenAIRE |
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