Apparent porous media gas dispersion in response to rapid pressure fluctuations
2011 (English)In: Soil science, ISSN 0038-075X, E-ISSN 1538-9243, Vol. 176, no 12, 635-641 p.Article in journal (Refereed) Published
The impact of rapid pressure fluctuations (frequency >0.02 min−1) on gas transport in two filter sands with different gas permeability (kg) was investigated. Pressure fluctuation–induced gas transport characterized as a dispersion process governed by a pressure fluctuation–induced dispersion coefficient (Dp) was measured using a column containing the sand, connected to a membrane pump for generating pressure fluctuations. Measurements ofDp in both sands were carried out for different combinations of pressure-fluctuation amplitude (A) and frequency (f). To assess if Dp is affected by the presence of a background steady gas flux in addition to the gas movement induced by the pressure fluctuations, Dpmeasurements were carried out for different constant pore gas velocities (u). Measurements of Dp corresponding to a total of 102 combinations of u, A, f, and kg were carried out. The results showed that the value of Dp increases with increasing A, f, and kg but is independent of u. Relations between Dp and A, f, and kg were generally strong.
Place, publisher, year, edition, pages
2011. Vol. 176, no 12, 635-641 p.
gas dispersion, soil permeability, pressure fluctuation
Other Environmental Engineering
Research subject Earth Science with specialization in Environmental Analysis
IdentifiersURN: urn:nbn:se:uu:diva-163141DOI: 10.1097/SS.0b013e3182372faeISI: 000298148600001OAI: oai:DiVA.org:uu-163141DiVA: diva2:462846