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            <title xml:lang="en">Turbulent mixing and dynamics in variable-viscosity free-fluid flows</title>
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            <idno type="stamp" n="CORIA">Complexe de recherche interprofessionnel en aerothermochimie</idno>
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                <title xml:lang="en">Turbulent mixing and dynamics in variable-viscosity free-fluid flows</title>
                <title xml:lang="fr">Mélange et dynamique de la turbulence en écoulements libres à viscosité variable</title>
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                <authority type="supervisor">Bruno Renou</authority>
                <authority type="supervisor">Luminita Danaila</authority>
                <authority type="jury">Dany Escudié [Président]</authority>
                <authority type="jury">R.a. Antonia</authority>
                <authority type="jury">Francesca Chillà</authority>
                <authority type="jury">Joël Delville</authority>
                <authority type="jury">Jan-Bert Flór</authority>
                <authority type="jury">Frédéric Risso</authority>
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                <term xml:lang="en">Turbulence</term>
                <term xml:lang="en">Variable density</term>
                <term xml:lang="en">Variable viscosity</term>
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                <term xml:lang="fr">Viscosité variable</term>
                <term xml:lang="fr">Densité variable</term>
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              <p>This work is devoted to the study of the undeveloped turbulence in heterogeneus gaseus mixtures, using experimental tools (Hot-wire Anemometry, Rayleigh Light Scattering, Laser Doppler Velocimetry) and analytical methods (variable-viscosity Navier Stokes equations). A new technique combining HWA and RLS is first adapted to reliabily measure the fluctuating velocity and concentration fields in variable-viscosity flows (herein, a propane-air mixture). A variable-viscosity round jet (propane emerging into an air-neon mixture) is characterized and compared with a turbulent air jet discharging into still air, at the same initial jet momentum. An analytical work is further performed with a particular focus on the jet axis, based on the Navier-Stokes equations including variable viscosity to support the experiments. It is shown that the kinetic energy dissipation rate is enhanced by several additional terms, particularly involving 'viscosity-velocity' correlations.</p>
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              <p>Ces travaux concernent l'étude expérimentale e analytique de la turbulence en phase de développement dans les fluides hétérogènes à densité et à viscosité variable. Ils font appel à des outils de diagnostics expérimentaux (anémométrie à fil chaud, technique de diffusion Rayleigh, Vélocimétrie Doppler Laser), et au formalisme des équations de Navier-Stockes à viscosité variable. L'innovation porte sur l'indépendance de la mesure de la vitesse. Après sa validation, la plate-forme expérimentale est exploitée pour l'étude comparative d'un jet de propane émergeant dans un milieu air-néon, à viscosité et densité variable, avec un jet d'air classique, à même quantité de mouvement injectée initialement. Ce travail se poursuit ensuite par un approfondissement des propriétés dans le champ proche, complétés par une approche analytique à partir des réécritures des équations de Navier-Stokes à viscosité variable.</p>
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