Influence of the disorder on tracer dispersion in a flow channel
| dc.creator | Charette, Victor Javier | |
| dc.creator | Evangelista, Elisa | |
| dc.creator | Chertcoff, Ricardo | |
| dc.creator | Auradou, Harold | |
| dc.creator | Hulin, Jean-Pierre | |
| dc.creator | Ippolito, Irene | |
| dc.date | 2006-10-14 | |
| dc.date.accessioned | 2026-07-07T08:26:34Z | |
| dc.date.available | 2026-07-07T08:26:34Z | |
| dc.description | 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 Péclet 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 Péclet 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 $Pe^α$ with $α= 0.5$ or $= 0.69$ (depending on the fluid viscosity). A simple model accounting for this latter result is suggested. | |
| dc.description | available online at http://www.edpsciences.org/journal/index.cfm?edpsname=epjap&niv1=contents&niv2=archives | |
| dc.identifier | https://arxiv.org/abs/physics/0610107 | |
| dc.identifier | http://arxiv.org/abs/physics/0610107 | |
| dc.identifier | European Physical Journal Applied Physics (2007) | |
| dc.identifier | doi:10.1051/epjap:2007110 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/136981 | |
| dc.subject | Fluid Dynamics | |
| dc.title | Influence of the disorder on tracer dispersion in a flow channel | |
| dc.type | text |