Title: Numerical Determination of the Effective Thermal Conductivity of Fibrous Materials - Application to PEFC Gas Diffusion Layers
Authors: VEYRET DamienTSOTRIDIS Georgios
Citation: JOURNAL OF POWER SOURCES vol. 195 no. 5 p. 1302-1307
Publication Year: 2010
JRC N°: JRC52894
ISSN: 0378-7753
URI: http://www.elsevier.com/locate/jpowsour
DOI: 10.1016/j.jpowsour.2009.09.028
Type: Articles in periodicals and books
Abstract: The knowledge of physical properties, such as the thermal conductivity, plays an important role in the management of the heat transfer in fibrous materials like PEFC gas diffusion layers. Measurement of thermal conductivity by experimental means is not easy (due to the anisotropy and the high porosity), therefore the availability of experimental data is rather limited. In this paper, the numerical determination of the effective thermal conductivity of fibrous materials is investigated using a three-dimensional approach. Two different fiber geometries were studied with randomly generated fiber structures with overlapping and non-overlapping fibers. The corresponding anisotropic thermal conductivities are computed through the solution of the energy transport equation. The results were validated through a comparison with existing experimental data and the influence of different parameters such as fiber orientation, fiber diameter and binding material were investigated.
JRC Directorate:Energy, Transport and Climate

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