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• W2034649640 abstract "The ratio between the effective bulk diffusion coefficient in macroporous media and the diffusion coefficient in the absence of the porous medium is analysed in terms of the porosity, the tortuosity and the constrictivity. The necessity of distinguishing these three parameters is supported by the description of diffusion in partly saturated homogeneous isotropic monodisperse sphere packings. The results are generalized to bulk diffusion in all homogeneous isotropic porous media in the porosity range 0–50 per cent. Le rapport entre le coefficient de diffusion effectif dans des milieux macroporeux et le coefficient de diffusion en absence de milieu poreux est décrit en fonction de la porosité, de la tortuositéet d'un facteur de rétrécissement. La nécessitéde discerner ces trois paramètres est soutenue par la description de la diffusion dans des empilements homogènes, isotropiques, et partiellement saturés de billes de verre monodispersés. Les résultats sont généralisésàtous les milieux poreux homogènes et isotropiques pour les porosités de 0à50 pour cent. Das Verhältnis zwischen dem Diffusionswiderstand eines porigen Gutes und der Diffusionszahl wird beschrieben als eine Funktion der Porosität, eines Umwegfaktors und eines Erweiterungsfaktors. Die Notwendigkeit, diese drei Parameter zu unterscheiden, ist durch die Funktion für die Beschreibung der Diffusion in homogenen, isotropen, teilweise gesättigten Schüttungen von monodispersen Glaskugeln bedingt. Die Resultate werden im Hinblick auf die Diffusion in allen homogenen, isotropen, porigen Gütern mit Porositäten von 0–50% verallgemeinert. Cooтнoшeниe мeждy эффeктивным кoэффициeнтoм диффyзии гaзa в кaпилляpнoпopиcтых тeлaх и кoэффициeнтoм диффyзии пpи oтcyтcтвии пopиcтoгo тeлa aнaлизиpyeтcя пpи пoмoщи cтpyктypных хapaктepиcтик : пopиcтocти, пpocвeтa и извилиcтocти. Heoбхoдимo paзлихaть эти тpи пapaмeтpa для oпиcaния диффyзии в хacтихнo нacыщeнных, oднopoдных, изoтpoпных мoнoдиcпepcных yпaкoвкaх cфepихecких хacтиц. Peзyльтaты oбoбщaютcя для вceх oднopoдных изoтpoпных пopиcтых тeл в oблacти пopиcтocти oт 0–50%." @default.
• W2034649640 created "2016-06-24" @default.
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• W2034649640 date "1974-09-01" @default.
• W2034649640 modified "2023-10-13" @default.
• W2034649640 title "Analysis of diffusion in macroporous media in terms of a porosity, a tortuosity and a constrictivity factor" @default.
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• W2034649640 doi "https://doi.org/10.1016/0017-9310(74)90190-2" @default.
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