dc.contributor.author	Menegay, Peter	en
dc.contributor.committeechair	Kornhauser, Alan A.	en
dc.contributor.committeemember	Vick, Brian L.	en
dc.contributor.committeemember	Thomas, William C.	en
dc.contributor.committeemember	Telionis, Demetri P.	en
dc.contributor.committeemember	Nelson, Douglas J.	en
dc.contributor.department	Mechanical Engineering	en
dc.date.accessioned	2014-03-14T20:21:28Z	en
dc.date.adate	1997-01-29	en
dc.date.available	2014-03-14T20:21:28Z	en
dc.date.issued	1997-01-29	en
dc.date.rdate	1997-01-29	en
dc.date.sdate	1998-07-18	en
dc.description.abstract	A 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
dc.description.degree	Ph. D.	en
dc.identifier.other	etd-2129201974500	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-2129201974500/	en
dc.identifier.uri	http://hdl.handle.net/10919/30340	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	appa.pdf	en
dc.relation.haspart	appb1.pdf	en
dc.relation.haspart	appb2.pdf	en
dc.relation.haspart	back.pdf	en
dc.relation.haspart	ch1.pdf	en
dc.relation.haspart	ch2.pdf	en
dc.relation.haspart	ch3.pdf	en
dc.relation.haspart	ch4.pdf	en
dc.relation.haspart	ch5a.pdf	en
dc.relation.haspart	ch5b.pdf	en
dc.relation.haspart	ch5c.pdf	en
dc.relation.haspart	ch5d.pdf	en
dc.relation.haspart	ch5e.pdf	en
dc.relation.haspart	ch6.pdf	en
dc.relation.haspart	etd.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	non-equilibrium	en
dc.subject	refrigeration	en
dc.subject	Computational fluid dynamics	en
dc.subject	two-fluid	en
dc.subject	jet	en
dc.title	A Computational Model for Two-Phase Ejector Flow	en
dc.type	Dissertation	en
thesis.degree.discipline	Mechanical Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	doctoral	en
thesis.degree.name	Ph. D.	en

A Computational Model for Two-Phase Ejector Flow

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