Pore-Scale Characterization of Organic Immiscible Liquid in Natural Porous Media Using Synchrotron X-ray Microtomography

Persistent Link:
http://hdl.handle.net/10150/194665
Title:
Pore-Scale Characterization of Organic Immiscible Liquid in Natural Porous Media Using Synchrotron X-ray Microtomography
Author:
Schnaar, Gregory
Issue Date:
2006
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The objective of this study was to characterize the pore-scale morphology of organic immiscible liquid residing within natural porous media. Synchrotron X-ray microtomography was used to obtain high-resolution, three-dimensional images of solid and liquid phases in packed columns. The image data were processed to generate quantitative measurements of organic-liquid blob morphology and organic liquid-water interfacial area. Five porous media comprising a range of median grain-sizes and grain-size distributions were used to evaluate the impact of porous-medium texture on organic-liquid blob morphology. The sizes and shapes of the organic-liquid blobs varied greatly, ranging from small spherical singlets to large, amorphous ganglia. The majority of the total organic-liquid surface area and volume was associated with the largest blobs. The distribution of blob sizes was greatest for the porous medium with the broadest particle-size and pore-size distributions. Organic-liquid blob morphology was additionally compared in two-phase (organic liquid-water) and three-phase (organic liquid-air-water) systems. In the three-phase systems, lenses and films of organic-liquid were observed in contact with air. Lenses were not observed in the two-phase systems. The presence of organic-liquid lenses and films resulted in larger surface area-to-volume ratios. The impact of dissolution on organic-liquid configuration and interfacial areas in two-phase systems was assessed. Organic-liquid blobs decreased in size and number as the columns were flushed. Separation of large multi-pore ganglia into distinct units was observed. Decrease in interfacial area correlated well with the decrease in organic-liquid volume. A one-dimensional first-order mass transfer expression was able to match effluent concentrations reasonably well with a single value of the mass transfer coefficient. In the final component of the study, immiscible-fluid configuration and interfacial areas were compared among organic liquid-water, air-water and air-organic liquid systems for two porous media. For both porous media, the nonwetting-phase configuration and interfacial areas were similar for the three two-fluid pair systems. This indicates that nonwetting phase configuration and wetting-nonwetting phase interfacial area are similar irrespective of the specific fluid pair. Properties of the porous medium appear to have a greater influence on the magnitude of specific total interfacial area for a given saturation than fluid properties or wetting-phase history.
Type:
text; Electronic Dissertation
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Soil, Water & Environmental Science; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Brusseau, Mark L.
Committee Chair:
Brusseau, Mark L.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titlePore-Scale Characterization of Organic Immiscible Liquid in Natural Porous Media Using Synchrotron X-ray Microtomographyen_US
dc.creatorSchnaar, Gregoryen_US
dc.contributor.authorSchnaar, Gregoryen_US
dc.date.issued2006en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe objective of this study was to characterize the pore-scale morphology of organic immiscible liquid residing within natural porous media. Synchrotron X-ray microtomography was used to obtain high-resolution, three-dimensional images of solid and liquid phases in packed columns. The image data were processed to generate quantitative measurements of organic-liquid blob morphology and organic liquid-water interfacial area. Five porous media comprising a range of median grain-sizes and grain-size distributions were used to evaluate the impact of porous-medium texture on organic-liquid blob morphology. The sizes and shapes of the organic-liquid blobs varied greatly, ranging from small spherical singlets to large, amorphous ganglia. The majority of the total organic-liquid surface area and volume was associated with the largest blobs. The distribution of blob sizes was greatest for the porous medium with the broadest particle-size and pore-size distributions. Organic-liquid blob morphology was additionally compared in two-phase (organic liquid-water) and three-phase (organic liquid-air-water) systems. In the three-phase systems, lenses and films of organic-liquid were observed in contact with air. Lenses were not observed in the two-phase systems. The presence of organic-liquid lenses and films resulted in larger surface area-to-volume ratios. The impact of dissolution on organic-liquid configuration and interfacial areas in two-phase systems was assessed. Organic-liquid blobs decreased in size and number as the columns were flushed. Separation of large multi-pore ganglia into distinct units was observed. Decrease in interfacial area correlated well with the decrease in organic-liquid volume. A one-dimensional first-order mass transfer expression was able to match effluent concentrations reasonably well with a single value of the mass transfer coefficient. In the final component of the study, immiscible-fluid configuration and interfacial areas were compared among organic liquid-water, air-water and air-organic liquid systems for two porous media. For both porous media, the nonwetting-phase configuration and interfacial areas were similar for the three two-fluid pair systems. This indicates that nonwetting phase configuration and wetting-nonwetting phase interfacial area are similar irrespective of the specific fluid pair. Properties of the porous medium appear to have a greater influence on the magnitude of specific total interfacial area for a given saturation than fluid properties or wetting-phase history.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineSoil, Water & Environmental Scienceen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorBrusseau, Mark L.en_US
dc.contributor.chairBrusseau, Mark L.en_US
dc.contributor.committeememberArtiola, Janick F.en_US
dc.contributor.committeememberCurry, Joanen_US
dc.identifier.proquest1703en_US
dc.identifier.oclc659747478en_US
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