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Image registration algorithm for molecular tagging velocimetry applied to unsteady flow in Hele-Shaw cell

Brunet, Florent and Cid, Emmanuel and Bartoli, Adrien and Bouche, Emmanuella and Risso, Frédéric and Roig, Véronique Image registration algorithm for molecular tagging velocimetry applied to unsteady flow in Hele-Shaw cell. (2013) Experimental Thermal and Fluid Science, 44. 897-904. ISSN 0894-1777

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2012.09.026


In order to develop velocimetry methods for confined geometries, we propose to combine image registration and volumetric reconstruction from a monocular video of the draining of a Hele-Shaw cell filled with water. The cell’s thickness is small compared to the other two dimensions (e.g. 1x400 x 800 mm3). We use a technique known as molecular tagging which consists in marking by photobleaching a pattern in the fluid and then tracking its deformations. The evolution of the pattern is filmed with a camera whose principal axis coincides with the cell’s gap. The velocity of the fluid along this direction is not constant. Consequently, tracking the pattern cannot be achieved with classical methods because what is observed is the integral of the marked molecules over the entire cell’s gap. The proposed approach is built on top of direct image registration that we extend to specifically model the volumetric image formation. It allows us to accurately measure the motion and the velocity profiles for the entire volume (including the cell’s gap) which is something usually hard to achieve. The results we obtained are consistent with the theoretical hydrodynamic behaviour for this flow which is known as the Poiseuille flow.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Experimental Thermal and Fluid Science website : http://dx.doi.org/10.1016/j.expthermflusci.2012.09.026
HAL Id:hal-00781722
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université d'Auvergne - UDA (FRANCE)
Laboratory name:
Deposited On:25 Jan 2013 14:41

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