Characteristics of a developing droplet - Laden jet impinging on a normal wall

The size-velocity characteristics of a droplet-laden air jet impinging on a normal wall is investigated using a phase-Doppler anemometer. The results of measurements conducted for two jet-exit-to-impingement-wall distances are presented. Experimental data are obtained across the jet at several axial stations covering the first ten jet-exit diameters. The radial variation of droplet mean velocity, rms velocity and skewness coefficient indicates that similarity is not achieved. The rate of spreading of the jet is higher than that noticed in both single-phase flow and previous two-phase flow studies. The presence of the impingement wall does not have a significant effect on the mean velocity distributions for Z/Z(i) < 0.8. There is an increase in droplet size with increasing distance from the nozzle for Z/D > 4.0. In the early regions of the jet, the water droplet size and velocity are strongly correlated, especially in the core regions. With increasing Z/D, there is no association between size and velocity.