Breakup behaviors of annular liquid jet from twin-fluid atomizers in crossflow

This study aims to improve the atomization effect of a liquid jet in crossflow. The atomizer consists of a single injection port, where the liquid and atomizing air are mixed and injected as a two-phase jet. This study used high-speed photographing, image processing, and optical thickness analysis to clarify the breakup mechanism of annular liquid film jets with different properties when they encountered crossflow. The results suggest that the uniformity of liquid film at the atomizer exit strongly dominate the jet breakup process. It was also found that the thickness of the liquid film formed at the exit of the short-mixing port atomizer is non-uniform, whereas the thickness of liquid film produced by the long-mixing port atomizer is relatively uniform, resulting in the spreading of the liquid film jet from the short-mixing port atomizer is larger. Based on the series of experimental results, it can be concluded that the uniformity of the annular liquid film jet is decisive for the atomization state of the two-phase jets in crossflow.