Journal article
Pore-scale characteristics of multiphase flow in porous media: A comparison of air-water and oil-water experiments
Studies of NAPL dissolution in porous media have demonstrated that measurement of saturation alone is insufficient to describe the rate of dissolution. Quantification of the NAPL-water interfacial area provides a measure of the expected area available for mass transfer and will likely be a primary determinant of NAPL removal efficiency.
To measure the interfacial area, we have used a synchrotron-based CMT technique to obtain high-resolution 3D images of flow in a Soltrol-water glass bead system. The interfacial area is found to increase as the wetting phase saturation decreases, reach a maximum, and then decrease as the wetting phase saturation goes to zero.
These results are compared to previous findings for an air-water-glass bead study; The Soltrol-water interfacial areas were found to peak at similar saturations as those measured for the air-water system (20-35% saturation range), however, the peak values were in some cases almost twice Lis high for the oil-water system.
We believe that the observed differences between the air-water and oil-water systems to a large degree can be explained by the differences in interfacial tensions for the two systems.
Language: | English |
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Year: | 2006 |
Pages: | 227-238 |
ISSN: | 18729657 and 03091708 |
Types: | Journal article |
DOI: | 10.1016/j.advwatres.2005.03.021 |