The mass transport in porous media for space applications is complicated by the absence of the stabilizing gravitational potential. Generally, the spatially-resolved moisture diffusivity in porous media is a function of the local saturation. Formal solutions of very few specific variable-diffusivity parabolic flows are known. We are using the finite difference numerical methods to solve the nonlinear wetting and de-wetting diffusion dynamics in microgravity conditions. Two different functional relationships between the saturation and the moisture-diffusivity were considered. The half-saturation action-radius and the zone-of-influence of the porous suction tubes on the cold-plate porous material are especially adversely affected by the exponentially changing, saturation-dependent, diffusivity. Clogging and biofouling dramatically decrease dynamic response and performance of the porous media flow.


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    Title :

    Nonlinear Variable-Diffusivity Moisture Transport in Zero Gravity Porous Media Space Applications


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Conference On Environmental Systems ; 2009



    Publication date :

    2009-07-12




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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