Variable temperature hot wire anemometry applied to the joint analysis of the velocity and temperature fluctuations in a mixing layer

M. Ndoye (1) , J. Delville (2) , E. Dorignac (2) , G. Arroyo (1)

1 UR TERE - Technologie des équipements agroalimentaires
2 PPrime [Poitiers] - Institut Pprime [UPR 3346]

Our study provides a detailed description of the thermal mixing process in an anisothermal mixing layer. Velocity and temperature are simultaneously measured at the same point by using a new hot wire anemometer. This anemometer implements the multiple overheat principle, associated with a non linear Levenberg-Marquardt signal processing. These simultaneous measurements allowed an analysis based on conditional Probability Density Functions (PDFs), joint PDFs and a quadrant analysis. Variable temperature hot wire anemometry clearly proved its ability to give access, in particular, to a precise description of the contributions of saddle point ejections to the thermal turbulent mixing process.

Mots clés: ECOULEMENT TURBULENT; ANEMOMETRE; COUCHE DE MELANGE; ANEMOMETRE A FIL CHAUD; TRANSFERT THERMIQUE

Domaines: Sciences de l'environnement

M. Ndoye, J. Delville, E. Dorignac, G. Arroyo. Variable temperature hot wire anemometry applied to the joint analysis of the velocity and temperature fluctuations in a mixing layer. 7ème International symposium on turbulence and shear flow layer, Jul 2011, Ottawa, Canada. 6 p. ⟨hal-00662406⟩