The University of Southampton
University of Southampton Institutional Repository

Modelling and simulation of all-vanadium redox flow batteries

Modelling and simulation of all-vanadium redox flow batteries
Modelling and simulation of all-vanadium redox flow batteries
Properties and applications of all-vanadium redox flow batteries are discussed and a two-dimensional model is developed. The model, which is based on a comprehensive description of mass, charge, energy and momentum transport and conservation, is combined with a global kinetic model for reactions involving vanadium species. Gas evolving reactions are then incorporated into the modelling frame work. Bubble formation as a result of evolution at the negative/positive 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. Comparisons to simulations with negligible gas 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 gas evolution are investigated. Significant variations in the gas volume fraction and the bubble velocity are predicted, depending on the operating conditions. The construction of a cell and charge/discharge experiments are described. Numerical simulations are compared to experimental data for different vanadium concentrations and mean linear electrolyte flow rates, demonstrating good agreement. Numerical simulations demonstrate the effect of changes in the operating temperature on performance of the all- vanadium redox flow battery and the extent of oxygen evolution. It is shown that variations in the electrolyte flow rate and the magnitude of the applied current substantially alter the charge/discharge characteristics, the temperature rise and the distribution of temperature. The effects of heat losses on the charge/discharge behaviour and temperature distribution are investigated. Conditions for localised heating and membrane degradation are discussed
Al-Fetlawi, Hassan Abdul-Zehra Abdul-Yima
0bee7503-a498-419f-a79e-2dd98ffb84e9
Al-Fetlawi, Hassan Abdul-Zehra Abdul-Yima
0bee7503-a498-419f-a79e-2dd98ffb84e9
SHAH, AKEEL
0ecbdd7a-88dc-486e-bf2b-7daea81477a5

Al-Fetlawi, Hassan Abdul-Zehra Abdul-Yima (2011) Modelling and simulation of all-vanadium redox flow batteries. University of Southampton, School of Engineering Sciences, Doctoral Thesis, 193pp.

Record type: Thesis (Doctoral)

Abstract

Properties and applications of all-vanadium redox flow batteries are discussed and a two-dimensional model is developed. The model, which is based on a comprehensive description of mass, charge, energy and momentum transport and conservation, is combined with a global kinetic model for reactions involving vanadium species. Gas evolving reactions are then incorporated into the modelling frame work. Bubble formation as a result of evolution at the negative/positive 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. Comparisons to simulations with negligible gas 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 gas evolution are investigated. Significant variations in the gas volume fraction and the bubble velocity are predicted, depending on the operating conditions. The construction of a cell and charge/discharge experiments are described. Numerical simulations are compared to experimental data for different vanadium concentrations and mean linear electrolyte flow rates, demonstrating good agreement. Numerical simulations demonstrate the effect of changes in the operating temperature on performance of the all- vanadium redox flow battery and the extent of oxygen evolution. It is shown that variations in the electrolyte flow rate and the magnitude of the applied current substantially alter the charge/discharge characteristics, the temperature rise and the distribution of temperature. The effects of heat losses on the charge/discharge behaviour and temperature distribution are investigated. Conditions for localised heating and membrane degradation are discussed

PDF
Phd.pdf - Other
Download (4MB)

More information

Published date: 14 April 2011
Organisations: University of Southampton

Identifiers

Local EPrints ID: 181523
URI: https://eprints.soton.ac.uk/id/eprint/181523
PURE UUID: 1819914f-6625-4995-8c69-8cc1f770e4dd

Catalogue record

Date deposited: 14 Jul 2011 11:05
Last modified: 18 Jul 2017 11:58

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×