NDLI: Transport and deposition of suspended particles in saturated porous media: hydrodynamic effect

Content Provider	Springer Nature Link
Author	Ahfir, Nasre Dine Wang, Hua Qing Benamar, Ahmed Alem, Adbellah Massei, Nicolas Dupont, Jean Paul
Copyright Year	2006
Abstract	A laboratory study was undertaken to determine the transport and deposition rate of suspended particles in columns of saturated porous media (gravel and glass beads), where the porous media were subjected to steady-state flow. Silt particles with a mode of 14 μm diameter (used as the suspended particles) and fluorescein (as the conservative tracer) were injected into the columns in short pulses. The breakthrough curves were competently described with the analytical solution of a convection–dispersion equation with a first-order deposition rate. The experiments were performed using different flow rates. The suspended particle size distribution, the porous media, and the flow rates themselves were the main factors retained in this study to investigate the mechanisms governing the transport and deposition kinetics in detail. The results showed the existence of a flow rate, beyond which suspended particles travel faster than the conservative tracer. A decrease of the deposition rate of suspended particles beyond a critical flow velocity was also observed. Such behaviour led to consideration of the couple hydrodynamic-gravity forces at high flow rates. As the hydrodynamic force increases, particle deposition rates are reduced due to the effect of hydrodynamic forces inhibiting the deposition.Une étude expérimentale en colonne de laboratoire a été menée pour analyser le transport et la cinétique de dépôt des particules en suspension, en écoulement permanent, dans deux milieux poreux saturés (gravier et billes de verre). Des particules de limon d’un diamètre modal de 14 μm (utilisées comme particules en suspension) et de la fluorescéine (comme traceur conservatif) sont introduits dans la colonne par des injections impulsions. Les courbes de restitution sont bien décrites par la solution analytique de l’équation de convection dispersion avec une cinétique de dépôt de premier ordre. Les expériences sont réalisées avec différents débits d’écoulement. La distribution de taille des particules en suspension, le milieu poreux et la vitesse d’écoulement sont les facteurs principaux retenus dans cette étude pour analyser les mécanismes régissant le transport et la cinétique de dépôt. Les résultats ont montré l’existence d’un débit au-delà duquel les particules en suspension sont transportées plus rapidement que le traceur conservatif. La diminution de la cinétique de dépôt des particules en suspension au-delà d’une vitesse critique est aussi observée. Ce comportement est lié à la compétition entre les forces hydrodynamiques et de gravité à forts débits. La cinétique de dépôt des particules diminue à mesure que la force hydrodynamique augmente, empêchant le dépôt.Un estudio del laboratorio fue emprendido, para determinar la tasa de transporte y depositación de partículas suspendidas, en unas columnas de medios porosos saturados (bolitas de grava y vidrio), dónde los medios porosos fueron sometidos a un flujo estacionario. Las partículas de limo con una moda de 14 μm de diámetro (usadas como las partículas suspendidas) y la fluoresceína (como el trazador conservador), se inyectaron en las columnas a manera de pulsos cortos. Las curvas de llegada se describieron adecuadamente con la solución analítica de una ecuación de dispersión-convección, con una tasa de depositación de primer orden. Los experimentos se realizaron usando diferentes tasas de flujo. La distribución de tamaño de las partículas suspendidas, el medio poroso, y las tasas de flujo en si mismas, fueron los factores principales contenidos en este estudio, para investigar los mecanismos que gobiernan el transporte y cinética de la depositación en detalle. Los resultados mostraron la existencia de una tasa de flujo, más allá de la cual, las partículas en suspensión, viajan más rápidamente que el trazador conservador. También fue observada una disminución de la tasa de la depositación de las partículas suspendidas más allá de una velocidad de flujo crítica. Tal comportamiento llevó a la consideración de la pareja de fuerzas hidrodinámica-gravedad en tasas de flujo altas. Con el aumento de la fuerza hidrodinámica, las tasas de depositación de partículas se reducen, debido al efecto de fuerzas hidrodinámicas que inhiben la depositación.
Starting Page	659
Ending Page	668
Page Count	10
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	15
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-11-21
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tracer tests Laboratory experiments/measurements Hydrodynamic Suspended particles Deposition rate Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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