A numerical study on effects of current density distribution, turbulence, and magnetohydrodynamics (MHD) on electrolytic gas flow with application to alkaline water electrolysis (AWE)
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Date
2024-07-20
Authors
Karimi-Sibaki, Ebrahim
Vakhrushev, Alexander
Wu, Menghuai
Boháček, Jan
Kharicha, Abdellah
ORCID
0000-0003-3319-4254Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
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Abstract
A three-phase Eulerian model is proposed to investigate the induced flow due to the generation of gas bubbles between two parallel plates without forced convection with application to alkaline water electrolysis (AWE). Earlier models, assuming a laminar regime, accurately predicted the multiphase flow near electrodes but struggled to calculate bulk liquid electrolyte flow away from them. Herein, we study the influences of electric current density distribution, turbulence effects, and the interaction between flow and the magnetic field known as magnetohydrodynamics (MHD). Based on our modeling results, the traditional method using an averaged uniform current density along electrodes (e.g. here 2000 A m 2) is feasible, as incorporating calculated nonuniform current distribution minimally affects the multiphase velocity field. The Lorentz force, originating from flow interaction with the (self-induced) magnetic field, is negligible compared to forces like drag or bubble dispersion. Consequently, MHD effects only become relevant upon introducing an external magnetic field. Including turbulence in the model, being minor in magnitude but non-negligible, significantly improves the predicted velocity profile. Modeling results are validated against an experiment.
Description
Citation
CHEMICAL ENGINEERING RESEARCH & DESIGN. 2024, vol. 208, issue 8, p. 731-739.
https://www.sciencedirect.com/science/article/pii/S0263876224004349
https://www.sciencedirect.com/science/article/pii/S0263876224004349
Document type
Peer-reviewed
Document version
Published version
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Language of document
en