3D Modeling Study of Bubble-Driven Flow and Its Interaction with Cell Operation
Samuel Théberge, Lukas Dion, Lászlo Kiss, Thomas Roger, Simon-Olivier Tremblay, Sébastien Guérard, Jean-François Bilodeau
TL;DR
This study uses 3D modeling to understand how bubbles affect flow and operations in aluminum electrolysis cells.
Contribution
The novel contribution is a 3D model capturing transient bubble dynamics and their impact on cell operations.
Findings
The model aligns with experimental data and reveals subtle interactions in the cell environment.
MHD flow orientation significantly affects bubble overvoltage and alumina mixing heterogeneity.
Optimizing cell design parameters like ACD range and evacuation channel width can improve efficiency.
Abstract
A detailed three-dimensional model of carbon dioxide generation and movement beneath the anode in an aluminum electrolysis cell has been developed. By incorporation of localized current density and multiple nucleation sites, the model captures the transient behavior of the anode–cathode distance (ACD) and the deformation of the bath–metal interface (BMI) caused by bubble dynamics. It also evaluates the pot’s response in terms of turbulent kinetic energy, providing insights into alumina dissolution efficiency and heat transfer mechanisms. The model further investigates how the MHD-induced flow direction and evacuation channel geometries impact bubble behavior, voltage fluctuations, and thermal distribution. The results not only align with existing experimental data but also shed light on subtle interplays within the cell environment. Notably, the orientation of the MHD flow emerges as a…
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Taxonomy
TopicsMolten salt chemistry and electrochemical processes · Advancements in Solid Oxide Fuel Cells · Metallurgical Processes and Thermodynamics