Title: Voxel-based modelling of water distribution in PEFC porous media
Authors : Dujc, Jaka
Stenzel, Ole
Holzer, Lorenz
Schumacher, Jürgen
Lamibrac, Adrien
Capone, Luigino
Conference details: 12th Symposium on Fuel Cell and Battery Modelling and Experimental Validation – ModVal 12, Freiburg, Germany, 26–27 March 2015
Issue Date: 2015
License (according to publishing contract) : Licence according to publishing contract
Type of review: Not specified
Language : English
Subjects : Tomography; PEFC; Map; Proton exchange membrane fuel cells
Subject (DDC) : 620.11: Engineering materials
621.3: Electrical engineering and electronics
Abstract: The macro-homogenous approach for modelling proton exchange membrane fuel cells (PEFCs) strives for optimisation of the fuel cell and its components. Water management in the gas diffusion layer (GDL) plays a fundamental role in the overall predictive power of a PEFC model. In our work the 3D-microstructures of the different cell components are investigated with modern and complementary imaging techniques such as X-ray tomography (GDL), FIB-tomography (MPL) and BIB-SEM (cross-sections of layer compounds). Transport relevant morphological parameters (i.e. phase volume fraction, tortuosity, constrictivity) are analysed for materials in the dry and in wet state. To circumvent the lack of a significant length scale separation between the pore-scale and the GDL thickness, we implemented a stochastic model that treats the water evolution in porous media on the corresponding voxel-data from tomography. The analysis, is based on the minimisation of the surface free energy and leads to a statistical physics characterisation of the water-medium interaction through advanced Monte Carlo simulation techniques. In such way the effective properties (permeability, conductivity) can be linked with the mentioned microstructure parameters and are used as input for modeling of the cell performance on a macro-homogeneous scale.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Conference Other
URI: https://digitalcollection.zhaw.ch/handle/11475/2126
Appears in Collections:Publikationen School of Engineering

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