Dispersion in Porous Mediums Due to Oscillating Flow

The existence of irregularly oscillating air flow in soils, induced by turbulence in the atmosphere, and the possible effect of such flow on the transport of water vapor and oxygen in soil, make dispersion in porous materials owing to oscillating gas flow of interest. Theoretical study indicated tha...

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Bibliographic Details
Published in:Water resources research 1968-12, Vol.4 (6), p.1201-1206
Main Authors: Scotter, D. R., Raats, P. A. C.
Format: Article
Language:English
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Summary:The existence of irregularly oscillating air flow in soils, induced by turbulence in the atmosphere, and the possible effect of such flow on the transport of water vapor and oxygen in soil, make dispersion in porous materials owing to oscillating gas flow of interest. Theoretical study indicated that, for oscillating flow in geometrically similar porous mediums, the rate of dispersion of miscible fluids can be expressed as a function of two dimensionless parameters, the Peclet number and the dimensionless amplitude of the displacement. Experiments designed to test this prediction included the measurement of the dispersion of oxygen in nitrogen in beds of randomly packed spheres subjected to oscillating gas flow. It was found that defining a dispersivity, analogous to a diffusivity, is meaningful, and that the dispersivity was strongly dependent on both the Peclet number and the dimensionless amplitude of the displacement. Data obtained using different sized spheres verified the conclusions deduced from the similarity analysis. (Key words: Dispersion; evaporation; porous mediums)
ISSN:0043-1397
1944-7973
DOI:10.1029/WR004i006p01201