Fronts in high-temperature laminar gas jets

Sánchez Sanz, Mario and Sánchez Pérez, Antonio Luis and Liñán Martínez, Amable (2006). Fronts in high-temperature laminar gas jets. "Journal of Fluid Mechanics", v. 547 ; pp. 257-266. ISSN 0022-1120.


Title: Fronts in high-temperature laminar gas jets
  • Sánchez Sanz, Mario
  • Sánchez Pérez, Antonio Luis
  • Liñán Martínez, Amable
Item Type: Article
Título de Revista/Publicación: Journal of Fluid Mechanics
Date: 2006
Volume: 547
Freetext Keywords: Gas jet; Laminar flow; Cocurrent flow; High temperature; Hot gas; Theoretical study; Temperature distribution; Cold gas; Velocity distribution; Mixing layer; Fluid injection; Jet gaz; Ecoulement laminaire; Ecoulement cocourant; Haute temperature; Gaz chaud; Etude theorique; Champ temperature; Gaz froid; Distribution vitesse; Couche melange; Injection fluide; Chorro gas; Flujo cocorriente; Alta temperatura; Gas caliente; Gas frio; Capa mezcladura; Fluid mechanics; Physics; Mecanique des fluides; Physique; Mecanica de los fluidos; Fisica
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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This paper addresses the slender laminar flow resulting from the discharge of a low-Mach-number hot gas jet of radius a and moderately large Reynolds number Rj into a cold atmosphere of the same gas. We give the boundary-layer solution for plane and round jets with very small values of the ambient-to-jet temperature ratio ε accounting for the temperature dependence of the viscosity and conductivity typical of real gases. It is seen that the leading-order description of the jet in the limit ε → 0 exhibits a front-like structure, including a precisely defined separating boundary at which heat conduction and viscous shear stresses vanish in the first approximation, so that the temperature and axial velocity remain unperturbed outside the jet. Separate analyses are given for the jet discharging into a stagnant atmosphere, when the jet boundary is a conductive front, and for the jet discharging into a coflowing stream, when the jet boundary appears as a contact surface. We provide in particular the numerical description of the jet development region corresponding to axial distances of order Rja for buoyant and non-buoyant jets, as well as the self-similar solutions that emerge both in the near field and in the far field. In all cases considered, comparisons with numerical integrations of the boundary-layer problem for moderately small values of ε indicate that these front descriptions give excellent predictions for the temperature and velocity fields in the near-axis region.

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Item ID: 864
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Deposited by: Archivo Digital UPM
Deposited on: 18 Feb 2008
Last Modified: 20 Apr 2016 06:34
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