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THE ROLE OF VORTICITY IN TURBULENT, RECTANGULAR, FREE AND WALL JETS

Thrassos Panidis
Laboratory of Applied Thermodynamics Department of Mechanical Engineering And Aeronautics University of Patras 26504 Rio-Patras, Greece

Andrew Pollard
Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario Canada K7L 3N6

Rainer Schwab
Department of Mechanical and Materials Engineering, Queen's University Kingston, K7L-3N6 Ontario, Canada

Sinopsis

Experimental results on the near field development of a rectangular jet with aspect ratio 10 are presented. The jet issues from a sharp-edged orifice attached to a rectangular settling chamber at ReDh ~ 42,000 either in free space or parallel to a flat wall. Measurements on cross plane grids obtained with a twocomponent hot wire anemometry probe, provide information on the three-dimensional characteristics of the flow field. Data were suitably averaged over the symmetrical areas of each cross section. Mean vorticity components and terms of the axial vorticity equation were estimated by interpolation and derivation of the mean velocity measurements. Key features of this type of jet are saddleback mean axial velocity profiles and a predominant dumbbell shape of the axial mean velocity contours. These characteristics are found to be influenced by the axial vorticity distribution, which is related to two terms in the axial mean vorticity transport equation that diffuse fluid from the center of the jet towards its periphery.