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NMR imaging of fluid pathways during drainage of softwood in a pressure membrane chamber

Abstract : An experiment was implemented to study fluid flow in a pressure media. This procedure successfully combines nuclear magnetic resonance imaging with a porous membrane chamber in order to visualize the non-wetting and wetting fluid flows with controlled boundary conditions. A specific pressure minute membrane chamber, made of non magnetic materials and able to withstand 4 MPa, was conceived and built for this purpose. These two techniques were applied to the drainage of Douglas fir sapwood. In the study of the longitudinal flow, narrow drainage fingers are formed in the latewood zones. They follow the longitudinal direction of wood and spread throughout the sample length. These fingers then enlarge in the cross-section plane and coalesce until drainage reach the whole latewood part. At the end of the essays, when drainage of liquid water in latewood is completed, just a few sites of percolation appear in earlywood zones. This difference is a result of the wood anatomical structure, where pits, the apertures that allow the sap to flow between wood cells, are more easily aspirated in earlywood than in latewood.
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Submitted on : Friday, March 3, 2017 - 11:50:01 AM
Last modification on : Monday, February 21, 2022 - 3:38:14 PM
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Almeida, Leclerc and Perre-mod...
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Giana Almeida, Sébastien Leclerc, Patrick Perre. NMR imaging of fluid pathways during drainage of softwood in a pressure membrane chamber. International Journal of Multiphase Flow, Elsevier, 2008, 34, pp.312 - 321. ⟨10.1016/j.ijmultiphaseflow.2007.10.009⟩. ⟨hal-01482134⟩



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