Mechanisms of Particle Transport Acceleration in Porous Media
Identifieur interne : 008B97 ( Main/Exploration ); précédent : 008B96; suivant : 008B98Mechanisms of Particle Transport Acceleration in Porous Media
Auteurs : M. Panfilov [France] ; I. Panfilova [France] ; Y. Stepanyants [Australie]Source :
- Transport in porous media [ 0169-3913 ] ; 2008.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Eau souterraine, Pollution.
English descriptors
- KwdEn :
Abstract
Experimental data show that the groundwater transport of radionuclides in porous media is frequently facilitated when accompanied with colloid particles. This is usually explained by the size exclusion mechanism which implies that the particles move through the largest pores where the flow velocity is higher. We call attention to three other mechanisms which influence the colloid particle motion, while determining both the probable transport facilitation and retardation. First of all, it is shown that the transport facilitation may be significantly reduced and even transformed into a retardation due to the growth of the effective suspension viscosity (a friction-limited facilitation). Secondly, we will show that the transport of particles through the largest pores can be retarded due to a reduced connectivity of the large-pore cluster (a percolation-breakup retardation). Thirdly, we highlight the Fermi mechanism of acceleration known in statistical physics which is based on the elastic collisions between particles. All three effects are analyzed in terms of the velocity enhancement factor, by using statistical models of porous media in the form of a capillary bundle and a 3D capillary network. Optimal and critical regimes of velocity enhancement are quantified. Estimations show that for realistic parameters, the maximal facilitation of colloid transport is close to the experimentally observed data.
Affiliations:
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Panfilov</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>LEMTA, Nancy-Université, CNRS, 2, Avenue de la Foret de Haye, BP 160</s1><s2>Vandoeuvre-les-Nancy 54504</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Nancy</settlement></placeName><orgName type="university">Nancy-Université</orgName></affiliation></author><author><name sortKey="Panfilova, I" sort="Panfilova, I" uniqKey="Panfilova I" first="I." last="Panfilova">I. Panfilova</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>LEMTA, Nancy-Université, CNRS, 2, Avenue de la Foret de Haye, BP 160</s1><s2>Vandoeuvre-les-Nancy 54504</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>54504</wicri:noRegion><wicri:noRegion>BP 160</wicri:noRegion><wicri:noRegion>Vandoeuvre-les-Nancy 54504</wicri:noRegion><orgName type="university">Nancy-Université</orgName><placeName><settlement type="city">Nancy</settlement><region type="region" nuts="2">Grand Est</region><region type="region" nuts="2">Lorraine (région)</region></placeName></affiliation></author><author><name sortKey="Stepanyants, Y" sort="Stepanyants, Y" uniqKey="Stepanyants Y" first="Y." last="Stepanyants">Y. Stepanyants</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>ANSTO, PMB 1, Menai</s1><s2>Sydney, NWS 2234</s2><s3>AUS</s3><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Sydney, NWS 2234</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Transport in porous media</title><title level="j" type="abbreviated">Transp. porous media</title><idno type="ISSN">0169-3913</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Transport in porous media</title><title level="j" type="abbreviated">Transp. porous media</title><idno type="ISSN">0169-3913</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>aquifers</term><term>capillarity</term><term>colloidal materials</term><term>critical regimes</term><term>experimental studies</term><term>friction</term><term>ground water</term><term>microstructures</term><term>models</term><term>networks</term><term>particles</term><term>particulate matters</term><term>percolation</term><term>pollution</term><term>porous media</term><term>radionucleids</term><term>suspension</term><term>transport</term><term>velocity</term><term>viscosity</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Particule</term><term>Transport</term><term>Milieu poreux</term><term>Eau souterraine</term><term>Aquifère</term><term>Radionucléide</term><term>Vitesse</term><term>Suspension</term><term>Viscosité</term><term>Frottement</term><term>Percolation</term><term>Modèle</term><term>Réseau</term><term>Régime critique</term><term>Matière particulaire</term><term>Etude expérimentale</term><term>Matière colloïdale</term><term>Capillarité</term><term>Pollution</term><term>Microstructure</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Eau souterraine</term><term>Pollution</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Experimental data show that the groundwater transport of radionuclides in porous media is frequently facilitated when accompanied with colloid particles. This is usually explained by the size exclusion mechanism which implies that the particles move through the largest pores where the flow velocity is higher. We call attention to three other mechanisms which influence the colloid particle motion, while determining both the probable transport facilitation and retardation. First of all, it is shown that the transport facilitation may be significantly reduced and even transformed into a retardation due to the growth of the effective suspension viscosity (a friction-limited facilitation). Secondly, we will show that the transport of particles through the largest pores can be retarded due to a reduced connectivity of the large-pore cluster (a percolation-breakup retardation). Thirdly, we highlight the Fermi mechanism of acceleration known in statistical physics which is based on the elastic collisions between particles. All three effects are analyzed in terms of the velocity enhancement factor, by using statistical models of porous media in the form of a capillary bundle and a 3D capillary network. Optimal and critical regimes of velocity enhancement are quantified. Estimations show that for realistic parameters, the maximal facilitation of colloid transport is close to the experimentally observed data.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Nancy</li></settlement><orgName><li>Nancy-Université</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Panfilov, M" sort="Panfilov, M" uniqKey="Panfilov M" first="M." last="Panfilov">M. Panfilov</name></region><name sortKey="Panfilova, I" sort="Panfilova, I" uniqKey="Panfilova I" first="I." last="Panfilova">I. Panfilova</name></country><country name="Australie"><noRegion><name sortKey="Stepanyants, Y" sort="Stepanyants, Y" uniqKey="Stepanyants Y" first="Y." last="Stepanyants">Y. Stepanyants</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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