Anisotropy of a thermal field at dissipative scales in the case of small-scale injection

L. Rosset (1) , P. Paranthoën (1) , J.-C. Lecordier (1) , M. Gonzalez (1)

1 CORIA - Complexe de recherche interprofessionnel en aérothermochimie

The anisotropy of a thermal field at the level of dissipation has been studied experimentally and by means of modeling, downstream of a heated line source placed, successively, in a turbulent boundary layer and a turbulent plane jet. This situation represents anisotropic small-scale injection of a passive scalar in a turbulent medium. All three instantaneous temperature gradients have been measured. In the central region of the thermal sheet, experimental data reveal a high degree of anisotropy of temperature dissipation near the line source and return to isotropy further downstream. Comparison of measurements with modeling allows interpreting the data and estimating the return-to-isotropy time scale.

Domaines: Mécanique des fluides [physics.class-ph]

L. Rosset, P. Paranthoën, J.-C. Lecordier, M. Gonzalez. Anisotropy of a thermal field at dissipative scales in the case of small-scale injection. Physics of Fluids, 2001, 13 (12), pp.3729 - 3737. ⟨10.1063/1.1410982⟩. ⟨hal-01437133⟩