Computational analysis of mass transfer limitation in porous electrodes of solid oxide electrochemical cell
- Marcin Błesznowski,
- Monika Sikora,
- Wojciech Orciuch,
- Łukasz Makowski,
- Jakub Kupecki
The limitations of mass transport at elevated temperature in porous electrodes of solid oxide cells (SOC) in conditions of significant concentration gradients of gas component is one of the key contributors to the performance operation of SOCs. Uneven and low porosity ~20% (after sintering process) affects the maximal performance and lifetime of electrodes. On the other side, high porosity (above 40%) reduces the mechanical stability of sintered SOC support layer. Due to complex nature of the mechanism and scale of analyzed case, a detailed computational fluid dynamic (CFD) modeling of diffusion transport in porous electrode was performed in order to analyze limiting factors of the mass transport through porous media at operating conditions of SOCs. Numerical investigation supported by microstructure characterization enabled understanding and distinguishing contributing process according to their significance and impact on the overall transportation in porous structures. A set of mathematical models of diffusive mass transport were examined. In the final stage, Dusty Gas Model (DGM) and Knudsen diffusion were selected and implemented in Fluent solver for the purpose of numerical study. The calculations done using CFD model will be verified during measurements of the pressure drop and gas composition in the flow field within the porous structures. Laboratory investigations and numerical analyses will be performed with supporting layer of SOC, fabricated in the Institute of Power Engineering in Poland. The influence of porosity will evaluated for a set of electrodes with porosity varied in the range from 15% to 35% (after sintering process), thickness from 0.55 mm to 1 mm. Systematic analysis of these parameters and their effects on the overall operation of SOCs allow determination of the limitations of diffusion mechanisms in porous structures at high temperature, in the regime of significant concentration gradients of gaseous components. Results of this work extend the range of optimal operating conditions for fuel cells, high temperature membranes, separators, selective sieves or porous filters.
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- Bucheli Olivier, Olivier Bucheli Geisser Gabriela, Gabriela Geisser Moore Fiona Fiona Moore [et al.] (eds.): EFCF 2020. Proceedings of the 14th European SOFC & SOE Forum. A sessions, 2020, Lucerne, European Fuel Cell Forum AG, 698 p., ISBN 978-3-905592-25-2
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- Błesznowski M. (i in.) - Computational analysis of.pdf
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- = 0.0, 06-05-2021, ChapterFromConference
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- Uwagi: This work was financially supported by the National Science Centre, Poland, Grant No. 2016/23/N/ST8/01580.
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