An analytical model for gas diffusion though nanoscale and microscale fibrous media

Dahua Shou, Jintu Fan, Maofei Mei, Feng Ding

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    63 Citations (Scopus)

    Abstract

    Gas diffusion in nanofibrous and microfibrous materials is of great interest in microfluidics. In this work, an analytical model is proposed, based on fractal theory, to quantify gas diffusion across fibrous media composed of nanofibers and microfibers. The fractal model is expressed in terms of pore area and tortuosity fractal dimensions, allowing statistical quantification of the geometrical structures of fibrous media. Knudsen diffusion in nanoscale pores is considered. To validate this model, moisture vapor diffusion rate through electrospun nanofibrous webs was measured using the inverted-cup method. The diffusivities predicted from the proposed model agree well with the experimental measurements in the present investigation and those reported in the literature for effective diffusivities of gas diffusion layers in fuel cells. Based on the model, the effect of porosity, fiber radius, and the ratio between the minimum and the maximum pore sizes on the effective diffusivity is analyzed.

    Original languageEnglish
    Pages (from-to)381-389
    Number of pages9
    JournalMicrofluidics and Nanofluidics
    Volume16
    Issue number1-2
    DOIs
    Publication statusPublished - Jan 2014

    Keywords

    • Fractal
    • Gas diffusion
    • Knudsen diffusion
    • Modeling
    • Nanofiber and microfiber

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Materials Chemistry

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