Experimental Study and Mechanism analysis of effervescent atomization

摘要

The flow and spray characteristic of effervescent atomization nozzle has been studied experimentally and the inner flow field was analyzed with numerical method. Experiments show that the injection pressure and air/liquid ratio (ALR) are the major factors impacting the atomization stability, and the flow coefficient of the nozzle ranged in 0.1-0.15. The VOF simulation of the inner flow field of the nozzle reveals the general transformation process of the bubble, and the region near the exit orifice plays the dominant role during the atomization process where miniature bubbles are generated, expanded in size and accelerated and interacting with the local flow field.