Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p41a0886h&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P41A-0886
Physics
5460 Physical Properties Of Materials, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
Water vapor diffusion is measured through porous media at Mars-like conditions and diffusion coefficients are obtained. A series of homogeneous porous glass disks exhibiting a range of pore sizes (10 to 220 microns) and thicknesses (0.25 to 8 cm) are used in initial experiments to validate the experimental setup and develop a system model. Correction factors to diffusion coefficients for gas-gas diffusion for this experimental geometry are obtained and applied to further samples. The values of porosity and grain/pore size studied cover the range of reasonable physical properties for near-surface Martian regolith. The diffusion coefficients for porous disks and unconsolidated Mars analog materials studied all fall within the range 5 to 15 cm2s-1, consistent with theoretical models. Calculated values of tortuosity factor also fall in the expected range of 2 to 5. Implications for ground-ice stability and equilibrium with the Martian climate are presented in the context of previous theoretical investigations.
Aharonson Oded
Bridges Nathan
Green John R.
Hecht Michael H.
Hudson Troy L.
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