Comptes Rendus
Étude expérimentale du dépôt de particules colloïdales en milieu poreux : Influence de l'hydrodynamique et de la salinité
Comptes Rendus. Mécanique, Volume 337 (2009) no. 9-10, pp. 682-692.

Cette Note se situe dans le cadre des études concernant le transport de colloïdes en milieux poreux, sujet qui concerne de nombreux domaines d'application tels que la contamination des eaux souterraines, le génie pétrolier ou le génie civil. Une étude expérimentale du dépôt de particules de Latex de polystyrène dans un milieu poreux artificiel consolidé est présentée. L'influence de la force ionique de la suspension colloïdale et du débit d'injection sur le dépôt de particules est étudiée. On observe que, au-delà d'une valeur critique, l'efficacité du collecteur (surface solide sur laquelle se déposent les particules) croît avec la force ionique alors que l'efficacité du collecteur décroît quand le débit d'injection augmente. Des mesures locales, par atténuation d'un rayonnement γ mettent en évidence la réduction de porosité due au dépôt de particules. Les épaisseurs de couches déposées, mesurées en fin d'expérience, correspondent à des structures de monocouches de particules déposées.

This study deals with colloid transport in porous media which applications are found in subsurface water, petroleum engineering or civil engineering. An experimental study of colloidal polystyrene Latex particles deposition in a consolidated porous medium is presented. The influence of ionic strength of the colloid suspension and the flow rate on particle deposition is investigated. We see first that beyond a critical salt concentration, the total collector efficiency increases with the ionic strength. Moreover, such collector efficiency decreases as the flow rate increases according to theory. In other respects, using a γ ray attenuation technique allows us to measure local porosity fluctuation due to particles deposition. By this way deposition kinetics may be followed locally and precisely. Nevertheless when considering the thickness of the adsorbed layer over large scales, obtained results using the γ rays attenuation technique are found in good agreement with those obtained by means of an usual technique especially at latest stages of adsorption process.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2009.08.002
Mot clés : Milieux poreux, Colloïdes, Dépôt, Force ionique
Keywords: Porous media, Colloid, Deposit, Ionic strength
Abdelkader Djehiche 1, 2 ; Vladimir Canseco 1 ; Aziz Omari 1 ; Henri Bertin 1

1 Laboratoire TREFLE (UMR CNRS 8508), Université de Bordeaux, Esplanade des Arts et Métiers, 33405 Talence cedex, France
2 Université Amar Telidji de Laghouat, BP 37G, Laghouat 03000, Algérie
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     title = {\'Etude exp\'erimentale du d\'ep\^ot de particules collo{\"\i}dales en milieu poreux : {Influence} de l'hydrodynamique et de la salinit\'e},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {682--692},
     publisher = {Elsevier},
     volume = {337},
     number = {9-10},
     year = {2009},
     doi = {10.1016/j.crme.2009.08.002},
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Abdelkader Djehiche; Vladimir Canseco; Aziz Omari; Henri Bertin. Étude expérimentale du dépôt de particules colloïdales en milieu poreux : Influence de l'hydrodynamique et de la salinité. Comptes Rendus. Mécanique, Volume 337 (2009) no. 9-10, pp. 682-692. doi : 10.1016/j.crme.2009.08.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.08.002/

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