Confined axisymmetric laminar jets with large expansion ratios

Revuelta Bayod, Antonio; Sánchez Pérez, Antonio Luis y Liñán Martínez, Amable (2002). Confined axisymmetric laminar jets with large expansion ratios. "Journal of Fluid Mechanics", v. 456 ; pp. 319-352. ISSN 0022-1120.

Descripción

Título: Confined axisymmetric laminar jets with large expansion ratios
Autor/es:
  • Revuelta Bayod, Antonio
  • Sánchez Pérez, Antonio Luis
  • Liñán Martínez, Amable
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Fluid Mechanics
Fecha: 2002
Volumen: 456
Materias:
Palabras Clave Informales: boundary layers; jets; laminar flow; Navier Stokes equations; pipe flow; stratified flow; vortices; confined axisymmetric laminar jets; large expansion ratios; steady round laminar jet; coaxial duct; jet Reynolds number; downstream flow; flow field; slender unconfined jet; constant momentum flux; jet entrainment; slow backflow motion; momentum exchange; toroidal vortex; nonslender transition zone; recirculating flow; boundary layer approximation; nonslender flows
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Motopropulsión y Termofluidodinámica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

This paper investigates the steady round laminar jet discharging into a coaxial duct when the jet Reynolds number, Re/sub j/, is large and the ratio of the jet radius to the duct radius, epsiv, is small. The analysis considers the distinguished double limit in which the Reynolds number Re/sub a/=Re/sub j/epsiv for the final downstream flow is of order unity, when four different regions can be identified in the flow field. Near the entrance, the outer confinement exerts a negligible influence on the incoming jet, which develops as a slender unconfined jet with constant momentum flux. The jet entrains outer fluid, inducing a slow backflow motion of the surrounding fluid near the backstep. Further downstream, the jet grows to fill the duct, exchanging momentum with the surrounding recirculating flow in a slender region where the Reynolds number is still of the order of Re/sub j/. The streamsurface bounding the toroidal vortex eventually intersects the outer wall, in a non-slender transition zone to the final downstream region of parallel streamlines. In the region of jet development, and also in the main region of recirculating flow, the boundary-layer approximation can be used to describe the flow, while the full Navier-Stokes equations are needed to describe the outer region surrounding the jet and the final transition region, with Re/sub a/=Re/sub j/epsiv entering as the relevant parameter to characterize the resulting non-slender flows.

Más información

ID de Registro: 861
Identificador DC: http://oa.upm.es/861/
Identificador OAI: oai:oa.upm.es:861
URL Oficial: http://journals.cambridge.org/action/displayJournal?jid=FLM
Depositado por: Archivo Digital UPM
Depositado el: 16 Feb 2008
Ultima Modificación: 20 Abr 2016 06:34
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