ARTICLE:

• EFFECT OF A PASSIVE DISTURBANCE ON THE HEAT TRANSPORT IN THE NEAR FIELD OF A ROUND JET  download article

P. Burattini
Physique Statistique et Plasmas Université Libre de Bruxelles, Belgium; School of Mechanical Engineering, University of Newcastle, Newcastle, 2308 NSW, Australia

L. Djenidi
Discipline of Mechanical Engineering, University of Newcastle, Australia

R. A. Antonia
School of Mechanical Engineering, University of Newcastle, Newcastle, 2308 NSW, Australia

ABSTRACT

Velocity and temperature measurements have been made in the near field of a round jet, with and without a disturbance. The disturbance, introduced by placing a grid at the nozzle exit, reduces the intensity of the natural instability of the jet and delays its development in the streamwise and radial directions. Velocity spectra and coherent vorticity contours show that vortical structures are inhibited by the disturbance. Correspondingly, the coherent heat flux in the radial direction is reduced, as compared to the undisturbed case.

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