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Article: Aggregate diffusion model applied to soil vapor extraction in unidirectional and radial flows

TitleAggregate diffusion model applied to soil vapor extraction in unidirectional and radial flows
Authors
Issue Date1996
Citation
Water Resources Research, 1996, v. 32 n. 5, p. 1289-1297 How to Cite?
AbstractAn aggregate diffusion model for soil vapor extraction is applied in this paper. The model accounts for the diffusion within water- saturated aggregates and convective diffusion in air-filled macropores. Focusing only on the dominant and measurable mechanisms, we represent the kinetic term for the gas aggregate exchange by a convolution integral. The nondimensional transport equation involves only three basic parameters: (1) Peclet number, (2) ratio of advection time to aggregate diffusion time, and (3) ratio of mass within aggregate to mass in gas. Two examples of soil vapor extraction based on the model are studied. The first problem is concerned with vapor transport in a one-dimensional column, and the theory is compared with published experiments. The second example deals with vapor extraction by a well centered at a radially symmetric contaminated zone. Effects of the physical parameters on contaminant removal are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/156436
ISSN
2015 Impact Factor: 3.792
2015 SCImago Journal Rankings: 2.661
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNg, COen_US
dc.contributor.authorMei, CCen_US
dc.date.accessioned2012-08-08T08:42:26Z-
dc.date.available2012-08-08T08:42:26Z-
dc.date.issued1996en_US
dc.identifier.citationWater Resources Research, 1996, v. 32 n. 5, p. 1289-1297en_US
dc.identifier.issn0043-1397en_US
dc.identifier.urihttp://hdl.handle.net/10722/156436-
dc.description.abstractAn aggregate diffusion model for soil vapor extraction is applied in this paper. The model accounts for the diffusion within water- saturated aggregates and convective diffusion in air-filled macropores. Focusing only on the dominant and measurable mechanisms, we represent the kinetic term for the gas aggregate exchange by a convolution integral. The nondimensional transport equation involves only three basic parameters: (1) Peclet number, (2) ratio of advection time to aggregate diffusion time, and (3) ratio of mass within aggregate to mass in gas. Two examples of soil vapor extraction based on the model are studied. The first problem is concerned with vapor transport in a one-dimensional column, and the theory is compared with published experiments. The second example deals with vapor extraction by a well centered at a radially symmetric contaminated zone. Effects of the physical parameters on contaminant removal are discussed.en_US
dc.languageengen_US
dc.relation.ispartofWater Resources Researchen_US
dc.titleAggregate diffusion model applied to soil vapor extraction in unidirectional and radial flowsen_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.doi10.1029/96WR00275en_US
dc.identifier.scopuseid_2-s2.0-0029844554en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0029844554&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume32en_US
dc.identifier.issue5en_US
dc.identifier.spage1289en_US
dc.identifier.epage1297en_US
dc.identifier.isiWOS:A1996UH88200013-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridNg, CO=7401705594en_US
dc.identifier.scopusauthoridMei, CC=35299759800en_US

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