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This paper presents the results of an experimental study of the near flowfields of turbulent free air jets issuing from sharp-edged rectangular slots of aspect ratio 2 and 10. The results, which include the mean streamwise velocity, the turbulence kinetic energy, the Reynolds shear stress and the transport of some of the Reynolds stresses, were obtained with hot-wire anemometry. Saddle-shaped mean streamwise velocity profiles, which were absent in the flow issuing from the slot of aspect ratio 2, were found in the flow issuing from the slot of aspect ratio 10 in the central plane of the slot major axis. In the very near flowfield (i. e., X/De < 5), higher shear-layer values of the turbulence kinetic energy and the Reynolds shear stress, indicating enhanced near-field mixing, were found where the saddle-shaped mean streamwise velocity profiles existed.
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W. R. Quinn (1991) studied this question.
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