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- W1983850629 abstract "Gas counterdiffusion of helium and air through membranes at uniform pressure is investigated theoretically and experimentally. By varying the pore diameter of a membrane from 0.015 μm to 2.0 μm, experiments with the two gases are carried out in the Knudsen region and in the transition region at atmospheric pressure. The selectivity of the membranes can be concluded from the experimental results. It is shown that the ratio of the molar fluxes is given by Graham's law, i.e. in isobaric counterdiffusion the molar flux is inversely proportional to the square root of the molar weight. For large pore diameters with respect to the mean free path of the gas molecules, the selectivity is extremely sensitive to pressure fluctuations as a non-selective laminar flow occurs. Therefore, in industrial applications, membranes should be used where the condition for Knudsen diffusion prevails. Die isobare, isotherme Gegendiffusion von Helium und Luft durch Membranen wird theoretisch und experimentell untersucht. Durch Variation des Porendurchmessers der Membranen von 0,015 μm bis 2,0 μm kann der Stofftransport sowohl im Knudsen- als auch im Übergangsgebiet unter atmosphärischen Bedingungen stattfinden. Aus den experimentellen Ergebnissen wird auf die Selektivität der Membranen rückgeschlossen. Es wird gezeigt, dass bei der isothermen Gegendiffusion die Beträge der Molenströme umgekehrt proportional zur Wurzel der Molekularmasse sind, d.h. die Selektivität der Membranen wird durch das Grahamsche Gesetz beschrieben und ist unabhängig vom Porendurchmesser. Für den Fall, dass der Porendurchmesser grösser als die mittlere freie Weglänge der beteiligten Gasmoleküle ist, wird die Selektivität der Membran empfindlich von Druckschwankungen beeinflusst, da eine nicht selective, laminare Strömung einsetzt. Bei industriellen Trennprozessen empfiehlt es sich deshalb, Membranen zu verwenden, bei denen der Stofftransport im Knudsenbereich stattfindet." @default.
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- W1983850629 date "1985-05-01" @default.
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- W1983850629 title "Experimental confirmation of Graham's law of diffusion up to pore diameters of 2 μm" @default.
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- W1983850629 doi "https://doi.org/10.1016/0255-2701(84)80018-5" @default.
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