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Abstract
This paper presents the results of an experimental study on the characteristics of very high velocity water jets in air. Based on a LDA study of the velocity field of jets of diameters of 2,2.5 and 3 mm with nozzle velocities in the range of 85 to 160 m/s, it was found that these very high velocity jets interact vigourously with the surrounding air and diffuse very much like submerged turbulent jets, but at a smaller rate. The velocity profiles at different axial distances were found to be approximately similar. The decay of the maximum axial velocity in terms of the nozzle velocity, with the relative distance from the nozzle was obtained. These jets were found to grow at a rate equal to approximately one-fourth that of submerged turbulent jets.
