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Imagerie par Résonance Magnétique pour la vélocimétrie d'un fluide en milieu poreux

Abstract : This study presents the development of measurement of porosity and velocity of flow made by MRI in packed beds with glass and polymer beads of various size saturated in water. The advantage of polymer beads is that they do not contain elements ferro or paramagnetics, contrary to the glass beads which disrupt the magnetic field creating artifacts on the MRI images. The calibration of the MRI velocity measurements was achieved from Poiseuille flow in a tube at different flow rates. Two situations were examined: first, the observation of interstitial flows between the beads minimizes partial volume effects and facilitates the correction of the phenomenon of phase aliasing. On the other hand, the measurement of average interstitial velocity (Darcy) requires using simultaneous velocity image and porosity image. In this case, it is preferable to adjust the strength of magnetic field gradient in the velocimetry sequence in a way to avoid any phase aliasing. The geometry of the flow cell was chosen to enable comparison by the MRI method between volume flow rates of water in the porous media and in the outer annulus.
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https://hal.univ-lorraine.fr/tel-01749545
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Wassim Salameh. Imagerie par Résonance Magnétique pour la vélocimétrie d'un fluide en milieu poreux. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL034N⟩. ⟨tel-01749545⟩

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