Predicting Oxygen Transfer in Hypolimnetic Oxygenation Devices

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dc.contributor.authorMcGinnis, Daniel Franken
dc.contributor.committeechairLittle, John C.en
dc.contributor.committeememberGallagher, Daniel L.en
dc.contributor.committeememberLove, Nancy G.en
dc.contributor.departmentCivil and Environmental Engineeringen
dc.date.accessioned2014-03-14T20:35:22Zen
dc.date.adate2000-05-08en
dc.date.available2014-03-14T20:35:22Zen
dc.date.issued2000-04-20en
dc.date.rdate2001-05-08en
dc.date.sdate2000-05-07en
dc.description.abstractThe purpose of this research was to apply a discrete-bubble model to predict the performance of several hypolimnetic oxygenators. The model is used to predict the oxygen transfer rate in a hypolimnetic oxygenator based on the initial bubble size formed at the diffuser. The discrete-bubble model is based on fundamental principles, and therefore could also be applied to other mass transfer applications involving the injection of bubbles into a fluid. The discrete-bubble model has been applied to a linear bubble-plume diffuser, a full-lift hypolimnetic aerator and the Speece Cone with promising results. The first step in this research was to investigate the principals of bubble formation at a submerged orifice, bubble rise velocity and bubble mass transfer. The discrete-bubble model is then presented. The model traces a single bubble rising through a fluid, accounting for changes in bubble size due to mass transfer, temperature and hydrostatic pressure. The bubble rise velocity and mass transfer coefficients are given by empirical correlations that depend on the bubble size. Bubble size is therefore recalculated at every increment and the values for the bubble rise velocity and mass transfer coefficients are continually updated. The discrete-bubble model is verified by comparison to experimental data collected in large-scale oxygen transfer tests. Finally, the discrete-bubble model is applied to the three most common hypolimnetic oxygenation systems: the Speece Cone, the bubble-plume diffuser, and the full-lift hypolimnetic oxygenation systems. The latter being presented by Vickie Burris in her thesis, <i>Hypolimnetic Aerators: Predicting Oxygen Transfer and Water Flow Rate</i>.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05072000-19320042en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05072000-19320042/en
dc.identifier.urihttp://hdl.handle.net/10919/32286en
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectoxygen transferen
dc.subjectdiscrete-bubble modelen
dc.subjecthypolimnetic oxygenationen
dc.titlePredicting Oxygen Transfer in Hypolimnetic Oxygenation Devicesen
dc.typeThesisen
thesis.degree.disciplineCivil and Environmental Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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