• français
    • English
    français
  • Login
Help
View Item 
  •   Home
  • Laboratoire Ingénierie des fluides Systèmes énergétiques (LIFSE)
  • View Item
  • Home
  • Laboratoire Ingénierie des fluides Systèmes énergétiques (LIFSE)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Mixing in turbulent compressible heated coaxial jets: A numerical study

Article dans une revue avec comité de lecture
Author
OUZANI, Riadh
ccSI AMEUR, Mohamed
ccKHELLADI, Sofiane
1003528 Laboratoire d'Ingénierie des Fluides et des Systèmes Énergétiques [LIFSE]
DANLOS, Amélie

URI
http://hdl.handle.net/10985/18215
DOI
10.1016/j.ijhydene.2020.01.194
Date
2020
Journal
International Journal of Hydrogen Energy

Abstract

The computation of compressible coaxial jets has moved into the field of interest not only in fundamental research but also in industrial applications, especially in chemical engineering. Numerical simulations of such flows are performed here, using a code specifically developed for gaseous turbulent flows which can also take into account chemical reactions. The coaxial jet can be regarded as a model of injection device in industrial applications; one can cite combustion and aeroacoustics technology. Three-dimensional numerical simulations in this configuration, already published by various authors in open literature are limited to incompressible isothermal flow. In our work, we have explicitly taken into account the temperature gradient effects on the dynamics and mixing mechanisms. Indeed, we have investigated a spatially developing compressible (isothermal and non-isothermal coaxial jet). The numerical model is based on time and space resolutions of compressible Navier-Stokes equations. The piece wise parabolic method (PPM) is combined with a linearized Riemann solver. This scheme adds non-linear dissipation intermittently just where and when needed in order to avoid spurious oscillations and guarantee monotonicity for the advection equation. The simulation can, therefore, be regarded aslarge-Eddy simulations: large scales are accurately solved with minimal viscosity and non-linear dissipation extracts energy out of the small scales in order to avoid non-physica loscillations. In order to study the mixing between Air-Air flows, we consider the mixture fraction f to track the mixing between two species seeded in the coaxial jets. A great attention is paid to the spatial-temporal evolution of the mixture fraction f, with aparticular interest to probability density function. The comparison between the numerical results and experimental data is fairly good, with respect to the mean and turbulent fields. We found that the inner potential core length in the non-isothermal configuration reduced with respect to the isothermal coaxial jet due to the gradient of temperature. It was shown that in the non-isothermal coaxial jet, the temperature gradient leads to the rapid development of the inner Kelvin-Helmholtz vortices implying an efficient mixing of the species close to the exit of the computational domain .

Files in this item

Name:
LIFSE_IJHE_2020_KHELLADI.pdf
Size:
6.172Mb
Format:
PDF
Description:
Article
Embargoed until:
2020-08-20
View/Open

Collections

  • Laboratoire Ingénierie des fluides Systèmes énergétiques (LIFSE)

Related items

Showing items related by title, author, creator and subject.

  • Linear stability of Rayleigh-Bénard-Poiseuille flow of water near 4°C in a channel bounded by slip walls 
    Article dans une revue avec comité de lecture
    BENBEGHILA, Aymen; ccOUZANI, Riadh; BENDERRADJI, Ammar; ALLOUI, Zineddine; ccKHELLADI, Sofiane (Elsevier BV, 2024-11)
    The onset of mixed convection of cold water in a horizontal channel is studied using linear stability analysis. The two walls of the channel are modeled using slip conditions and are maintained at different constant ...
  • High thermal Rayleigh number with double-diffusive finger convection: Effect of nonlinear equation of state 
    Article dans une revue avec comité de lecture
    ccOUZANI, Riadh; ccKHELLADI, Sofiane; ccNOGUEIRA, Xesús (Elsevier BV, 2024-11)
    In this study, we numerically investigate the effects of the nonlinearity in the equation of state on the structure of fingers and the transport mechanisms of salt and heat in double-diffusive finger convection, utilizing ...
  • Numerical study of salt fingers dynamics: Effects of the density inversion 
    Article dans une revue avec comité de lecture
    OUZANI, Riadh; ccKHELLADI, Sofiane (Elsevier BV, 2023-05)
    In the present study, numerical simulations have been employed to understand the effect of the density inversion on the finger structures dynamics and mixing process. A numerical methodology based on the finite volume ...
  • Investigation of asymmetric heating in Poiseuille-Rayleigh-Bénard water flow: A numerical study 
    Article dans une revue avec comité de lecture
    BENBEGHILA, Aymen; OUZANI, Riadh; BENDERRADJI, Ammar; ABID, Chérifa; ccKHELLADI, Sofiane (Elsevier BV, 2025-01)
    In this paper, a numerical investigation of the impact of asymmetric heating on laminar mixed convection in Poiseuille-Rayleigh-Bénard water flow within parallel horizontal channels is presented. The study has been carried ...
  • POD study of aerated cavitation in a venturi nozzle 
    Communication avec acte
    TOMOV, Petar; DANLOS, Amélie; ccRAVELET, Florent; ccSARRAF, Christophe; ccBAKIR, Farid; ccKHELLADI, Sofiane (IOP sciences conference series, 2015)
    The fact of injecting bubbles into a cavitating flow influences typical cavitating behavior. Cavitation and aerated cavitation experiments has been carried out on a symmetrical venturi nozzle with convergent/divergent ...

Browse

All SAMCommunities & CollectionsAuthorsIssue DateCenter / InstitutionThis CollectionAuthorsIssue DateCenter / Institution

Newsletter

Latest newsletterPrevious newsletters

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales