Statistics – Computation
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stia...8713869c&link_type=abstract
Soil Science (ISSN 0038-075X), vol. 141, April 1986, p. 289-297.
Statistics
Computation
Gas Pressure, Gas Transport, Gaseous Diffusion, Knudsen Flow, Porosity, Soil Science, Diffusion Coefficient, Earth (Planet), Mars (Planet), Mathematical Models, Size (Dimensions)
Scientific paper
The analytical principles and applications of the theory of Knudsen diffusion are reviewed, with emphasis on gas transport in the soils of planetary bodies. Knudsen diffusion occurs when the mean free path of diffusing gas molecules surpasses the size of the pores through which diffusion proceeds. The process is then dominated by collisions with the pore walls. Computational techniques for deriving the Knudsen coefficient for soils with a nonreentrant cross-section shape are reviewed, along with methods of deriving a coefficient for soils which permit both Knudsen and bulk diffusion. Sample calculations for three pore-size distributions are provided to illustrate the decrease in transport efficiency with increasingly smaller soil pore sizes.
Clifford Stephen M.
Hillel Daniel
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