Variable-density jet flows induced by concentrated sources of momentum and energy

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dc.contributor.author Sánchez Sanz, Mario
dc.contributor.author Sánchez, Antonio L.
dc.contributor.author Liñán Martínez, Amable
dc.date.accessioned 2014-02-06T16:29:34Z
dc.date.available 2014-02-06T16:29:34Z
dc.date.issued 2011-10-01
dc.identifier.bibliographicCitation Theoretical and computational fluid dynamics, Vol. 25, nº 5 (Oct. 2011), pp. 281-292
dc.identifier.issn 0935-4964
dc.identifier.issn 1432-2250 (online)
dc.identifier.uri http://hdl.handle.net/10016/18221
dc.description.abstract The planar and axisymmetric variable-density flows induced in a quiescent gas by a concentrated source of momentum that is simultaneously either a source or a sink of energy are investigated for application to the description of the velocity and temperature far fields in laminar gaseous jets with either large or small values of the initial jet-to-ambient temperature ratio. The source fluxes of momentum and heat are used to construct the characteristic scales of velocity and length in the region where the density differences are of the order of the ambient density, which is slender for the large values of the Reynolds number considered herein. The problem reduces to the integration of the dimensionless boundary-layer conservation equations, giving a solution that depends on the gas transport properties but is otherwise free of parameters. The boundary conditions at the jet exit for integration are obtained by analysing the self-similar flow that appears near the heat source in planar and axisymmetric configurations and also near the heat sink in the planar case. Numerical integrations of the boundary-layer equations with these conditions give solutions that describe accurately the velocity and temperature fields of very hot planar and round jets and also of very cold plane jets in the far field region where the density and temperature differences are comparable to the ambient values. Simple scaling arguments indicate that the point source description does not apply, however, to cold round jets, whose far field region is not large compared with the jet development region, as verified by numerical integrations.
dc.description.sponsorship This collaborative research was supported by the Spanish MICINN under Project # ENE2008-06515-C04 and by the Comunidad de Madrid under Project# S2009/ENE-1597 (HYSYCOMB)
dc.format.extent 12
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Springer
dc.rights © Springer-Verlag 2010
dc.subject.other Point source
dc.subject.other Laminar jet
dc.subject.other Boundary-layer approximation
dc.subject.other Gaseous flow
dc.title Variable-density jet flows induced by concentrated sources of momentum and energy
dc.type article
dc.relation.publisherversion http://dx.doi.org/10.1007/s00162-010-0196-4
dc.subject.eciencia Ingeniería Industrial
dc.identifier.doi 10.1007/s00162-010-0196-4
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2009/ENE-1597/HYSYCOMB
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 281
dc.identifier.publicationissue 5
dc.identifier.publicationlastpage 292
dc.identifier.publicationtitle Theoretical and computational fluid dynamics
dc.identifier.publicationvolume 25
dc.identifier.uxxi AR/0000008106
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