Speaker
Description
Direct numerical simulations are performed on reconstructed two-scale three-dimensional digital images in order to compute the effective diffusion properties of a gas diffusion layer (GDL) made of the assembly of a fibrous gas diffusion medium (GDM) and a microporous layer (MPL). The two-scale digital images are obtained by using micro X-ray computed tomography for the microporous GDM microstructure and MPL cracks, and focused ion beam-scanning electron microscopy (FIB-SEM) for the nanoporous MPL matrix. The MPL matrix effective diffusion tensor is first computed from the FIB-SEM reconstructed 3D images considering Knudsen and Fickian diffusions. Then the GDM-MPL assembly effective through-plane diffusion coefficient is computed thanks to a mixed approach combining a continuum description for the MPL matrix and the explicit discretization of the MPL cracks and GDM pore space. The impact of MPL cracks on the assembly diffusion properties is evaluated by comparison with the case without cracks. The impact of the MPL penetration into the GDM and the impact of the GDM compressibility are evaluated using a diffusive resistance model, validated from the numerical simulations.
References
[1] G. Inoue, K. Yokoyama, J. Ooyama, T. Terao, T. Tokunaga, N. Kubo, M. Kawase, Journal of Power Sources 327 (2016) 610–621.
[2] Y Guo, X He, W Huang, M Wang, Transport in Porous Media 126 (2019) 431–453.
[3] Y.-C. Chen, C. Karageorgiou, J. Eller, T. J. Schmidt, F. N. Büchi, Journal of Power Sources 539 (2022) 231612.
| Participation | In-Person |
|---|---|
| Country | France |
| Energy Transition Focused Abstracts | This abstract is related to Energy Transition |
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