Image registration algorithm for molecular tagging velocimetry applied to unsteady flow in Hele-Shaw cell - Archive ouverte HAL Access content directly
Journal Articles Experimental Thermal and Fluid Science Year : 2013

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

Abstract

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.
Fichier principal
Vignette du fichier
Roig_8037.pdf (1.19 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00781722 , version 1 (28-01-2013)

Identifiers

Cite

Florent Brunet, Emmanuel Cid, Adrien Bartoli, Emmanuella Bouche, Frederic Risso, et al.. Image registration algorithm for molecular tagging velocimetry applied to unsteady flow in Hele-Shaw cell. Experimental Thermal and Fluid Science, 2013, vol. 44, pp. 897-904. ⟨10.1016/j.expthermflusci.2012.09.026⟩. ⟨hal-00781722⟩
247 View
117 Download

Altmetric

Share

Gmail Facebook X LinkedIn More