• Login
    View Item 
    •   Shocker Open Access Repository Home
    • Engineering
    • Mechanical Engineering
    • ME Research Publications
    • View Item
    •   Shocker Open Access Repository Home
    • Engineering
    • Mechanical Engineering
    • ME Research Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Effective diffusivity in partially-saturated carbon-fiber gas diffusion layers: effect of local saturation and application to macroscopic continuum models

    Date
    2015-11-20
    Author
    Garcia-Salaberri, Pablo A.
    Gostick, Jeff T.
    Hwang, Gisuk
    Weber, Adam Z.
    Vera, Marcos
    Metadata
    Show full item record
    Citation
    Garcia-Salaberri, Pablo A.; Gostick, Jeff T.; Hwang, Gisuk; Weber, Adam Z.; Vera, Marcos. 2015. Effective diffusivity in partially-saturated carbon-fiber gas diffusion layers: effect of local saturation and application to macroscopic continuum models. Journal of Power Sources, vol. 296, 20 November 2015:pp 440–453
    Abstract
    Macroscopic continuum models are an essential tool to understand the complex transport phenomena that take place in gas diffusion layers (GDLs) used in polymer electrolyte fuel cells (PEFCs). Previous work has shown that macroscopic models require effective properties obtained under uniform saturation conditions to get a consistent physical formulation. This issue, mostly unappreciated in the open literature, is addressed in detail in this work. To this end, lattice Boltzmann simulations were performed on tomographic images of dry and water-invaded carbon-paper GDL subsamples with nearly uniform porosity and saturation distributions. The computed effective diffusivity shows an anisotropic dependence on local porosity similar to that reported for morphologically analogous GDLs. In contrast, the dependence on local saturation is rather isotropic, following a nearly quadratic power law. The capability of the local correlations to recover the layer-scale properties obtained from inhomogeneous GDLs is checked by global averaging. Good agreement is found between the upscaled results and the diffusivity data of the GDL from which the present subsamples were taken, as well as other global data presented in the literature. A higher blockage effect of local saturation is, however, expected for the under-the-rib region in operating PEFCs.
    Description
    Click on the DOI link to access the article may not be fee).
    URI
    http://dx.doi.org/10.1016/j.jpowsour.2015.07.034
    http://hdl.handle.net/10057/11537
    Collections
    • ME Research Publications

    Browse

    All of Shocker Open Access RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsBy TypeThis CollectionBy Issue DateAuthorsTitlesSubjectsBy Type

    My Account

    LoginRegister

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    DSpace software copyright © 2002-2023  DuraSpace
    DSpace Express is a service operated by 
    Atmire NV