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dc.contributor.authorMenegay, Peteren_US
dc.date.accessioned2014-03-14T20:21:28Z
dc.date.available2014-03-14T20:21:28Z
dc.date.issued1997-01-29en_US
dc.identifier.otheretd-2129201974500en_US
dc.identifier.urihttp://hdl.handle.net/10919/30340
dc.description.abstractA CFD model to simulate two-phase flow in refrigerant ejectors is described. This work is part of an effort to develop the ejector expansion refrigeration cycle, a device which increases performance of a standard vapor compression cycle by replacing the throttling valve with a work-producing ejector. Experimental results have confirmed the performance benefit of the ejector cycle, but significant improvement can be obtained by optimally designing the ejector. The poorly understood two-phase, non-equilibrium flow occuring in the ejector complicates this task. The CFD code is based on a parabolic two-fluid model. The applicable two-phase flow conservation equations are presented. Also described are the interfacial interaction terms, important in modelling non-equilibrium effects. Other features of the code, such as a mixing length turbulence model and wall function approximation, are discussed. Discretization of the equations by the control volume method and organization of the computer program is described. Code results are shown and compared to experimental data. It is shown that experimental pressure rise through the mixing section matches well against code results. Variable parameters in the code, such as droplet diameter and turbulence constants, are shown to have a large influence on the results. Results are shown in which an unexpected problem, separation in the mixing section, occurs. Also described is the distribution of liquid across the mixing section, which matches qualitative experimental observations. From these results, conclusions regarding ejector design and two-phase CFD modelling are drawn.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartappa.pdfen_US
dc.relation.haspartappb1.pdfen_US
dc.relation.haspartappb2.pdfen_US
dc.relation.haspartback.pdfen_US
dc.relation.haspartch1.pdfen_US
dc.relation.haspartch2.pdfen_US
dc.relation.haspartch3.pdfen_US
dc.relation.haspartch4.pdfen_US
dc.relation.haspartch5a.pdfen_US
dc.relation.haspartch5b.pdfen_US
dc.relation.haspartch5c.pdfen_US
dc.relation.haspartch5d.pdfen_US
dc.relation.haspartch5e.pdfen_US
dc.relation.haspartch6.pdfen_US
dc.relation.haspartetd.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectnon-equilibriumen_US
dc.subjectrefrigerationen_US
dc.subjectCFDen_US
dc.subjecttwo-fluiden_US
dc.subjectjeten_US
dc.titleA Computational Model for Two-Phase Ejector Flowen_US
dc.typeDissertationen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairKornhauser, Alan A.en_US
dc.contributor.committeememberVick, Brian L.en_US
dc.contributor.committeememberThomas, William C.en_US
dc.contributor.committeememberTelionis, Demetri P.en_US
dc.contributor.committeememberNelson, Douglas J.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-2129201974500/en_US
dc.date.sdate1998-07-18en_US
dc.date.rdate1997-01-29
dc.date.adate1997-01-29en_US


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