Droplet size-velocity characteristics of sprays generated by two-phase feed nozzles

The present study focuses on the evaluation of the droplet size velocity ch aracteristics of sprays generated using two-phase flow feed nozzles. Two ty pes of nozzles were used in the study and for convenience these are designa ted as Nozzle-A and Nozzle-B, respectively. Liquid nitrogen is used to simu late feeds that undergo vaporization upon injection into the processing ves sel and air is used as the carrier gas. For each test, the liquid flow rate and the aeration rate are varied and the droplet size-velocity measurement s are conducted using a Phase-Doppler Particle Analyzer. The droplet size a nd velocity measurements are carried out at various axial locations along t he spray. At each axial location, measurements are performed at various rad ial positions. The main variables of interest include the droplet velocity, droplet diameter, droplet count fraction and the droplet size-velocity cor relation factor. The results indicate that the two nozzles considered in th e present study generate sprays with varying characteristics. The aeration rate has a larger influence on the spray generated by Nozzle-B. The droplet size distributions are found to be sensitive to changes in the aeration ra te. The droplet velocity characteristics are different from those reported in earlier studies on single-phase and droplet-laden jets.