Abstract

This paper reports an experimental investigation of the near-field mixing characteristics of a turbulent jet issuing from a notched-rectangular orifice plate. Planar particle image velocimetry (PIV) was used for measurements of the velocity field with the exit Reynolds number = 72,000. Comparison is made of the results for this jet and its circular countpart obtained under the identical conditions. Consistent with previous investigations of other noncircular jets, the notched jet has an overall superior mixing capability over the circular jet. This is reflected by a shorter potential core and higher decay and spread rates of the jet. Also, the axis switching occurs in this jet. Of particular interest, the notched jet entrains the surroundings immediately downstream from the nozzle at a much higher rate than do the circular and other noncircular jets.

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