Persistent Link:
http://hdl.handle.net/10150/186852
Title:
Air entrainment and oxygenation by overfalling nappes.
Author:
Hadjerioua, Boualem.
Issue Date:
1994
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:
This research analyzes air entrainment and flow conditions of overfalling nappes and the behavior of bubbles in the plunge pools leading to oxygenation of the water. A literature search indicated that these phenomena have never been analyzed as a whole. An experimental/analytical/numerical approach is used to estimate the rate of oxygenation by nappes over weirs. The experimental investigation was done at the Tennessee Valley Authority (TVA) Engineering Laboratory, Norris, Tennessee. An air-water concentration probe (developed by Lamb and Killen, 1950) was calibrated and used to determine contours of air concentration in the plunge pool. Representative bubble sizes were determined using high-speed photography. The air set in motion by the nappe was computed analytically by integrating the momentum and continuity equations over the air boundary layer. Comparison with the air in the plunge pool established the fraction of the boundary entering the plunge pool. A three-dimensional, fluid flow solver was used to compute a representative water flow field in the plunge pool. Using that water flow field, the trajectory and residence time of bubbles in the plunge pool were then computed by solving the two-dimensional Lagrangian equations of motion. Included in this calculation is the mass transfer of air from the bubble over its trajectory using an empirical mass transfer coefficient. From this calculation, the rate of oxygenation was determined for the overall plunge pool. The analytical results show good agreement with the experimental data collected by the author and with other findings documented in the literature.
Type:
text; Dissertation-Reproduction (electronic)
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Civil Engineering and Engineering Mechanics; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Laursen, Emmett M.; Petersen, Margaret S.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleAir entrainment and oxygenation by overfalling nappes.en_US
dc.creatorHadjerioua, Boualem.en_US
dc.contributor.authorHadjerioua, Boualem.en_US
dc.date.issued1994en_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.abstractThis research analyzes air entrainment and flow conditions of overfalling nappes and the behavior of bubbles in the plunge pools leading to oxygenation of the water. A literature search indicated that these phenomena have never been analyzed as a whole. An experimental/analytical/numerical approach is used to estimate the rate of oxygenation by nappes over weirs. The experimental investigation was done at the Tennessee Valley Authority (TVA) Engineering Laboratory, Norris, Tennessee. An air-water concentration probe (developed by Lamb and Killen, 1950) was calibrated and used to determine contours of air concentration in the plunge pool. Representative bubble sizes were determined using high-speed photography. The air set in motion by the nappe was computed analytically by integrating the momentum and continuity equations over the air boundary layer. Comparison with the air in the plunge pool established the fraction of the boundary entering the plunge pool. A three-dimensional, fluid flow solver was used to compute a representative water flow field in the plunge pool. Using that water flow field, the trajectory and residence time of bubbles in the plunge pool were then computed by solving the two-dimensional Lagrangian equations of motion. Included in this calculation is the mass transfer of air from the bubble over its trajectory using an empirical mass transfer coefficient. From this calculation, the rate of oxygenation was determined for the overall plunge pool. The analytical results show good agreement with the experimental data collected by the author and with other findings documented in the literature.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineCivil Engineering and Engineering Mechanicsen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairLaursen, Emmett M.en_US
dc.contributor.chairPetersen, Margaret S.en_US
dc.contributor.committeememberContractor, Dinshaw N.en_US
dc.contributor.committeememberInce, Simonen_US
dc.contributor.committeememberClark, Robert A.en_US
dc.contributor.committeememberRasmussen, William O.en_US
dc.identifier.proquest9506984en_US
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