The two-phase flow inside an effervescent atomizer is studied experimentally using water and air as simulants. The transition in flow structures is reconfirmed while the quantitative measurements show that the mean bubble diameter increases with GLR and decreases with increase in chamber pressure. The temporal analysis is also carried out. The intermittent presence of single-phase and two-phase flow is observed inside the orifice at lower GLR that possibly induces the unsteadiness in the external spray characteristics. In annular flow regime, however, the two-phase flow is consistently maintained inside the orifice and this diminishes the intensity of unsteadiness.
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