Abstract
IN a recent monograph1, Carman dismisses the suggestion that the spreading pressure ϕ is the operative force in the diffusion of adsorbed molecules with the statement that the coefficient of resistance of such an equation varies more rapidly with concentration than does the diffusion coefficient of Fick's equation. In presenting his arguments for this view, Carman gives for diffusion under a spreading pressure the equation: where W s /At is the number of moles diffusing across unit area of adsorbent in time t under the influence of a gradient ∂ϕ/∂x of the spreading pressure. 1/B ϕ is a two-dimensional resistance constant.
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References
Carman, P. C., “Flow of Gases through Porous Media”, 122 (Butterworths Scientific Pub., London, 1956).
Babbitt, J. D., Can. J. Research, A, 28, 449 (1950).
Babbitt, J. D., Can. J. Phys., 29, 437 (1951).
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BABBITT, J. Diffusion of Adsorbed Molecules. Nature 182, 201 (1958). https://doi.org/10.1038/182201a0
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DOI: https://doi.org/10.1038/182201a0
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