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In this paper, the atomization characteristics of an effervescent atomizer were investigated. The velocity, Sauter Mean Diameter ( SMD ) and atomization cone angle of the droplets were measured using the Phase Doppler Analyzer (PDA) to discuss the effect of different design parameters. The results showed that the atomization was unstable at a small Gas-Liquid Rate ( GLR ) while the atomization proved gradually by increasing the  GLR . The optimal atomization region was at a  GLR =0.1. In the atomization process, there existed a typical velocity distribution for the swirl atomizer. The design parameters of atomizer provided a great influence on the Sauter Mean Diameter ( SMD ) and atomization cone angle. The experiment results showed that some droplets had negative velocities.

Effect of the two-phase hybrid mode of effervescent atomizer on the atomization characteristics