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Article: Effects of a semipervious lens on soil vapour extraction

TitleEffects of a semipervious lens on soil vapour extraction
Authors
Issue Date1997
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=FLM
Citation
Journal Of Fluid Mechanics, 1997, v. 341, p. 385-413 How to Cite?
AbstractWe describe a theory for the removal of volatile organic chemicals from an unsaturated soil stratum consisting of highly porous coarse sand layers sandwiching a thin and semipervious lens. Each soil layer is modelled as a periodic array of spherical aggregates formed by solid grains and immobile water trapped by surface tension. Volatile chemicals are vaporized in the mobile air in pores between aggregates, dissolved in the intra-aggregate water, and adsorbed on the surface of soil grains. Using the effective transport equations derived for the aggregated soils, we consider shallow layers with sharp contrast in physical properties. An asymptotic analysis is developed for an axisymmetric geometry, yielding quasi-one-dimensional governing equations for individual layers. At the leading order the flow and the vapour transport are horizontal in the coarse layers but vertical in the semipervious lens. Numerical results are presented for a simple example to demonstrate the significance of the lens permeability, diffusivity and retardation factor, and the aggregate diffusivity in the coarse layers, on the vapour transport during the stages of contamination and air-venting.
Persistent Identifierhttp://hdl.handle.net/10722/156463
ISSN
2015 Impact Factor: 2.514
2015 SCImago Journal Rankings: 1.450
References

 

DC FieldValueLanguage
dc.contributor.authorNg, COen_US
dc.contributor.authorMei, CCen_US
dc.date.accessioned2012-08-08T08:42:31Z-
dc.date.available2012-08-08T08:42:31Z-
dc.date.issued1997en_US
dc.identifier.citationJournal Of Fluid Mechanics, 1997, v. 341, p. 385-413en_US
dc.identifier.issn0022-1120en_US
dc.identifier.urihttp://hdl.handle.net/10722/156463-
dc.description.abstractWe describe a theory for the removal of volatile organic chemicals from an unsaturated soil stratum consisting of highly porous coarse sand layers sandwiching a thin and semipervious lens. Each soil layer is modelled as a periodic array of spherical aggregates formed by solid grains and immobile water trapped by surface tension. Volatile chemicals are vaporized in the mobile air in pores between aggregates, dissolved in the intra-aggregate water, and adsorbed on the surface of soil grains. Using the effective transport equations derived for the aggregated soils, we consider shallow layers with sharp contrast in physical properties. An asymptotic analysis is developed for an axisymmetric geometry, yielding quasi-one-dimensional governing equations for individual layers. At the leading order the flow and the vapour transport are horizontal in the coarse layers but vertical in the semipervious lens. Numerical results are presented for a simple example to demonstrate the significance of the lens permeability, diffusivity and retardation factor, and the aggregate diffusivity in the coarse layers, on the vapour transport during the stages of contamination and air-venting.en_US
dc.languageengen_US
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=FLMen_US
dc.relation.ispartofJournal of Fluid Mechanicsen_US
dc.titleEffects of a semipervious lens on soil vapour extractionen_US
dc.typeArticleen_US
dc.identifier.emailNg, CO:cong@hku.hken_US
dc.identifier.authorityNg, CO=rp00224en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0031171049en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031171049&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume341en_US
dc.identifier.spage385en_US
dc.identifier.epage413en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridNg, CO=7401705594en_US
dc.identifier.scopusauthoridMei, CC=7103364150en_US

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