Flow and diffusion of a two-species gas mixture in a porous slab.

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dc.contributor.authorRitchie, AIMen_AU
dc.date.accessioned2007-11-22T04:27:09Zen_AU
dc.date.accessioned2010-04-30T04:38:07Zen_AU
dc.date.available2007-11-22T04:27:09Zen_AU
dc.date.available2010-04-30T04:38:07Zen_AU
dc.date.issued1977-10en_AU
dc.description.abstractProblem of mass transport of oxygen is considered in a soil whose upper surface is open to air at atmospheric pressure and in which the oxygen is preferentially removed at some reaction surface within the body of the soil. The soil is assumed to be a permeable slab filled with a two-species gas mixture, the first of which is removed at one face of the slab, while the other face is maintained at constant pressure (~ atmospheric) . It is shown that the maximum removal rate of the first gas is largely determined by the diffusion coefficient of the second gas, but enhanced to some extent by gas flow due to the pressure difference set up by gas removal. This pressure difference is very small (~ 10-4 atmospheres) even at the maximum removal rate. It is also shown that under some conditions, which are satisfied in the case of oxygen removal from air, the concentration of the first gas has the same functional dependence on distance, as expected in the case of diffusion with no gas flow, but with an enhanced diffusion coefficient. For the problem of interest, this enhancement is about 20 per cent.en_AU
dc.identifier.citationRitchie, A. I. M. (1977). Flow and diffusion of a two-species gas mixture in a porous slab. (AAEC/E430). Lucas Heights, NSW: Australian Atomic Energy Commission.en_AU
dc.identifier.govdoc659en_AU
dc.identifier.isbn0642596328en_AU
dc.identifier.otherAAEC-E-430en_AU
dc.identifier.placeofpublicationLucas Heights, New South Walesen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/649en_AU
dc.language.isoen_auen_AU
dc.publisherAustralian Atomic Energy Commissionen_AU
dc.subjectGaseous diffusionen_AU
dc.subjectGas flowen_AU
dc.subjectSoilsen_AU
dc.subjectPorous materialsen_AU
dc.titleFlow and diffusion of a two-species gas mixture in a porous slab.en_AU
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