Observation of Gas-Liquid Flow Near the Exit Orifice of An Effervescent Atomizer

For deepen the understanding of the mechanism of effervescent atomization; it is necessary to have a better observation on the gas-liquid flow near the exit orifice. Both image and acoustic ways were introduced to observe the gas-fluid flow by a transparent effervescent atomizer. The results show that: It can be clearly seen from images that internal flow regimes make great influence on the spray behavior. Spray acoustic observation is an effective way to grasp the gas-liquid two phases flow behavior when they ejecting from the exit orifice. The acoustic analyzing in time and frequency domain has the ability to obtain the discrete phenomenon existing in effervescent sprays, in thus way, acoustic features could give a new perspective on effervescent spray over time. What's more, the discrete phenomenon in dilute bubbly flow and slug flow can be easily captured from after acoustic analyzing. Uniform two-phase distribution of internal flow shows continues acoustic performance after observing the homogeneous bubbly flow and churn flow.