[Mesures par LIF des écoulements miscibles dans une cellule Hele–Shaw : mise au point et résultats préliminaires]
Afin de quantifier les champs de concentration lors de l'injection d'une solution saline dans une cellule de type Hele–Shaw, représentant sous certaines conditions un modèle analogue à un milieu poreux, un banc de mesures basé sur une méthode LIF a été mis au point. Cette technique a impliqué l'utilisation d'un laser pulsé dont le faisceau défocalisé illumine la cellule sous la forme d'une tache laser. Afin de s'affranchir de la non uniformité spatiale et temporelle de l'intensité lumineuse de cette tache, un procédé de compilation de plusieurs images brutes successives a été envisagé. Ce traitement conduit à une description fine de la zone de mélange (doigt) et l'obtention des profils longitudinaux et transversaux en concentration. La comparaison avec une autre technique de mesure, basée sur l'absorption lumineuse, a souligné les améliorations apportés par notre système tant en termes de précision que de répétabilité.
To be able to quantify concentration fields during a salt solute injection in a Hele–Shaw cell, an analogue medium to a porous media under specific conditions, an apparatus based on LIF technique has been set. This technique uses a diverged pulsed laser illuminating the cell in a light spot. To overcome the spatial and temporal light energy nonuniformity a data reduction involving the stacking of several consecutive rough images has been defined. This data reduction leads to a very good description of the mixing zone (finger) as well as both longitudinal and transversal concentration profiles. Comparison with another technique (light absorption) highlights the improvement our system provides both in precision and repeatability.
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Mot clés : Mécanique des fluides, Fluorescence Induite par Laser, Écoulement miscible, Cellule Hele–Shaw
Jon Mainhagu 1 ; Constantin Oltéan 1 ; Fabrice Golfier 1 ; Michel A. Buès 1
@article{CRMECA_2007__335_2_105_0,
author = {Jon Mainhagu and Constantin Olt\'ean and Fabrice Golfier and Michel A. Bu\`es},
title = {Measurement by {Laser} {Induced} {Fluorescence} on miscible density driven flows in a {Hele{\textendash}Shaw} cell: settings and preliminary results},
journal = {Comptes Rendus. M\'ecanique},
pages = {105--112},
publisher = {Elsevier},
volume = {335},
number = {2},
year = {2007},
doi = {10.1016/j.crme.2007.01.006},
language = {en},
}
TY - JOUR AU - Jon Mainhagu AU - Constantin Oltéan AU - Fabrice Golfier AU - Michel A. Buès TI - Measurement by Laser Induced Fluorescence on miscible density driven flows in a Hele–Shaw cell: settings and preliminary results JO - Comptes Rendus. Mécanique PY - 2007 SP - 105 EP - 112 VL - 335 IS - 2 PB - Elsevier DO - 10.1016/j.crme.2007.01.006 LA - en ID - CRMECA_2007__335_2_105_0 ER -
%0 Journal Article %A Jon Mainhagu %A Constantin Oltéan %A Fabrice Golfier %A Michel A. Buès %T Measurement by Laser Induced Fluorescence on miscible density driven flows in a Hele–Shaw cell: settings and preliminary results %J Comptes Rendus. Mécanique %D 2007 %P 105-112 %V 335 %N 2 %I Elsevier %R 10.1016/j.crme.2007.01.006 %G en %F CRMECA_2007__335_2_105_0
Jon Mainhagu; Constantin Oltéan; Fabrice Golfier; Michel A. Buès. Measurement by Laser Induced Fluorescence on miscible density driven flows in a Hele–Shaw cell: settings and preliminary results. Comptes Rendus. Mécanique, Volume 335 (2007) no. 2, pp. 105-112. doi : 10.1016/j.crme.2007.01.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.01.006/
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