Abstract
RIGDEN1 has given a modified form of Kozeny's equation, corrected for the 'slip' which becomes appreciable when the voids of the powder are not incomparably greater in width than the molecular mean free path of the gas. If the voids are much narrower than the mean free path, however, so that intermolecular collisions are very rare, the flow ceases to be governed by the viscosity of the gas and becomes a process of diffusion.
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Rigden, P. J., Nature, 157, 268 (1946).
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HOLMES, W. Flow of Gases through Fine Powders and the Measurement of Specific Surface. Nature 157, 694 (1946). https://doi.org/10.1038/157694a0
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DOI: https://doi.org/10.1038/157694a0
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