AN EXPERIMENTAL-STUDY OF VERY HIGH-VELOCITY CIRCULAR WATER JETS IN AIR

This paper presents the results of an experimental study on the charac teristics of very high velocity water jets in air. Based on a LDA stud y of the velocity field of jets of diameters of 2, 2.5 and 3 mm with n ozzle velocities in the range of 85 to 160 m/s, it was found that thes e very high velocity jets interact vigourously with the surrounding ai r and diffuse very much like submerged turbulent jets, but at a smalle r rate. The velocity profiles at different axial distances were found to be approximately similar. The decay of the maximum axial velocity i n terms of the nozzle velocity, with the relative distance from the no zzle was obtained. These jets were found to grow at a rate equal to ap proximately one-fourth that of submerged turbulent jets.