Dynamic modelling of hydrogen evolution effects in the all-vanadium redox flow battery
Dynamic modelling of hydrogen evolution effects in the all-vanadium redox flow battery
A model for hydrogen evolution in an all-vanadium redox flow battery is developed, coupling the dynamic conservation equations for charge, mass and momentum with a detailed description of the electrochemical reactions. Bubble formation at the negative electrode is included in the model, taking into account the attendant reduction in the liquid volume and the transfer of momentum between the gas and liquid phases, using a modified multiphase-mixture approach. Numerical simulations are compared to experimental data for different vanadium concentrations and mean linear electrolyte flow rates, demonstrating good agreement. Comparisons to simulations with negligible hydrogen evolution demonstrate the effect of gas evolution on the efficiency of the battery. The effects of reactant concentration, flow rate, applied current density and gas bubble diameter on hydrogen evolution are investigated. Significant variations in the gas volume fraction and the bubble velocity are predicted, depending on the operating conditions
bubble formation, flow battery, hydrogen evolution, mathematical model, numerical simulation
1125-1139
Shah, A.A.
5c43ac37-c4a7-4256-88ef-8c427886b924
Al-Fetlawi, H.A.
8544fc8a-1c0c-4eb8-b828-fe71a4e9efb6
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
January 2010
Shah, A.A.
5c43ac37-c4a7-4256-88ef-8c427886b924
Al-Fetlawi, H.A.
8544fc8a-1c0c-4eb8-b828-fe71a4e9efb6
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Shah, A.A., Al-Fetlawi, H.A. and Walsh, F.C.
(2010)
Dynamic modelling of hydrogen evolution effects in the all-vanadium redox flow battery.
Electrochimica Acta, 55 (3), .
(doi:10.1016/j.electacta.2009.10.022).
Abstract
A model for hydrogen evolution in an all-vanadium redox flow battery is developed, coupling the dynamic conservation equations for charge, mass and momentum with a detailed description of the electrochemical reactions. Bubble formation at the negative electrode is included in the model, taking into account the attendant reduction in the liquid volume and the transfer of momentum between the gas and liquid phases, using a modified multiphase-mixture approach. Numerical simulations are compared to experimental data for different vanadium concentrations and mean linear electrolyte flow rates, demonstrating good agreement. Comparisons to simulations with negligible hydrogen evolution demonstrate the effect of gas evolution on the efficiency of the battery. The effects of reactant concentration, flow rate, applied current density and gas bubble diameter on hydrogen evolution are investigated. Significant variations in the gas volume fraction and the bubble velocity are predicted, depending on the operating conditions
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Published date: January 2010
Keywords:
bubble formation, flow battery, hydrogen evolution, mathematical model, numerical simulation
Organisations:
Thermofluids and Superconductivity
Identifiers
Local EPrints ID: 72200
URI: http://eprints.soton.ac.uk/id/eprint/72200
ISSN: 0013-4686
PURE UUID: 72dce9c4-7182-4960-8b0a-5e76fa142a8c
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Date deposited: 15 Feb 2010
Last modified: 13 Mar 2024 21:19
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Author:
A.A. Shah
Author:
H.A. Al-Fetlawi
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