Abstract
The development of flourescence-based experimental techniques that can be used to obtain quantitative information about the flow of fluids through porous media is reported. Flow information is obtained by illuminating a two-dimensional slice of refractive index matched model of a porous medium with a planar laser beam. The flowing liquid phase is seeded with 10-μm diameter flourescent particles, and time-sequenced photographs of the illuminated plane provide quantitative information about the velocity of the flowing liquid. The method provides simultaneous measurements of point level and spatially averaged velocity vectors within the interstitial spaces of the medium. Porosity and preliminary tracer concentration measurements were made in a similar manner with the use of a flourescent dye. The use of flourescence, spectral filtering and refractive index matching permits a unique application of particle and tracer imaging to the study of flow in porous systems. The results from this technique compare favorably with the expected macroscopically derived results; the significance of these results and methodology is that they provide experimental verification of fundamental multi-phase transport equations. The application of this technique might be extended to experimental studies of flow in optically transparent models of biological, chemical and physical systems.
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