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Etude expérimentale d'une couche de mélange anisotherme

Abstract : A non-isothermal plane mixing-layer has been studied in several conditions as regard the velocity and temperature gradients imposed as inlet conditions. The flow was generated in a wind-tunnel specifically designed to study the mixing of low velocity parallel streams adjusted separately in velocity and temperature. A novel technique, based on a Parameterizable Constant Temperature Anemometer (PCTA), was used to measure simultaneously the velocity and the temperature at a single point at high frequencies. The transverse profiles obtained at different positions along the streamwise direction giving access to the expansion parameters of the mixing-layer, the expansion rates of the vorticity thickness and thermal mixing thickness were compared in relation with the coefficient , related to the shear stress, and the Richardson number. The ability of the PCTA to deliver simultaneous measurements at high frequency will enable, in future works, a finer analysis of velocity-temperature interactions in the turbulent mixing process.
Mots-clés : FIL CHAUD
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Conference papers
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https://hal.inrae.fr/hal-02590109
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Submitted on : Friday, May 15, 2020 - 1:59:36 PM
Last modification on : Wednesday, October 20, 2021 - 3:22:08 AM

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  • HAL Id : hal-02590109, version 1
  • IRSTEA : PUB00023438

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N. Ndoye, E. Dorignac, Julien Carlier, G. Arroyo, J. Delville, et al.. Etude expérimentale d'une couche de mélange anisotherme. 18ème congrès français de mécanique, Grenoble, 27 au 31 août 2007, 2007, pp.7. ⟨hal-02590109⟩

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