Influence of the disorder on solute dispersion in a flow channel
| Autor: | Jean-Pierre Hulin, Elisa Evangelista, Irene Ippolito, Harold Auradou, R. Chertcoff, Victor Charette |
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| Přispěvatelé: | Grupo de Medios Porosos [Buenos Aires] (GMP), Facultad de Ingeniería [Buenos Aires] (FIUBA), Universidad de Buenos Aires [Buenos Aires] (UBA)-Universidad de Buenos Aires [Buenos Aires] (UBA), Fluides, automatique, systèmes thermiques (FAST), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2007 |
| Předmět: |
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
Capillary action 47.56.+r 05.60.Cd Taylor dispersion 0207 environmental engineering Mixing (process engineering) FOS: Physical sciences 02 engineering and technology Péclet number 01 natural sciences Molecular physics 010305 fluids & plasmas Pipe flow symbols.namesake porous media Optics 0103 physical sciences chanelization mixing Tube (fluid conveyance) 020701 environmental engineering Instrumentation business.industry Chemistry Fluid Dynamics (physics.flu-dyn) Hydrodynamic dispersion Physics - Fluid Dynamics Condensed Matter Physics Electronic Optical and Magnetic Materials Taylor bead packed bed symbols business Dispersion (chemistry) Porous medium |
| Zdroj: | European Physical Journal: Applied Physics European Physical Journal: Applied Physics, 2007, http://www.edpsciences.org/journal/index.cfm?edpsname=epjap&niv1=contents&niv2=archives. ⟨10.1051/epjap:2007110⟩ European Physical Journal: Applied Physics, EDP Sciences, 2007, http://www.edpsciences.org/journal/index.cfm?edpsname=epjap&niv1=contents&niv2=archives. ⟨10.1051/epjap:2007110⟩ |
| ISSN: | 1286-0050 1286-0042 |
| Popis: | Tracer dispersion is studied experimentally in periodic or disordered arrays of beads in a capillary tube. Dispersion is measured from light absorption variations near the outlet following a steplike injection of dye at the inlet. Visualizations using dye and pure glycerol are also performed in similar geometries. Taylor dispersion is dominant both in an empty tube and for a periodic array of beads: the dispersivity $l\_d$ increases with the P\'eclet number $Pe$ respectively as $Pe$ and $Pe^{0.82}$ and is larger by a factor of 8 in the second case. In a disordered packing of smaller beads (1/3 of the tube diameter) geometrical dispersion associated to the disorder of the flow field is dominant with a constant value of $l\_d$ reached at high P\'eclet numbers. The minimum dispersivity is slightly higher than in homogeneous nonconsolidated packings of small grains, likely due heterogeneities resulting from wall effects. In a disordered packing with the same beads as in the periodic configuration, $l\_d$ is up to 20 times lower than in the latter and varies as $Pe^\alpha$ with $\alpha = 0.5$ or $= 0.69$ (depending on the fluid viscosity). A simple model accounting for this latter result is suggested. Comment: available online at http://www.edpsciences.org/journal/index.cfm?edpsname=epjap&niv1=contents&niv2=archives |
| Databáze: | OpenAIRE |
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