Pressure Jet Spray in Air Stream

A study has been made of droplet trajectories in a hollow cone pressure-jet water spray operating in a uniform axial airflow of 13.9 m/s. Use of a double spark light source enabled measurements of drop velocities, sizes and angles of trajectories to be made on droplets in the size range 20 to 250 microns with velocities up to 37 m/s. Entrainment into the spray of the surrounding airflow was found to be negligible in a wind tunnel and it was found possible to predict the trajectories of individual drops on the basis of the steady-state equation of motion for single solid spheres in an infinite quiescent atmosphere. Average droplet behavior could not be predicted because of the wide variation in initial droplet conditions.