Bubble formation at multiple orifices

Abstract

This study presents a systematic study of bubbling synchronicity and frequency for bubble formation at multiple (two to six) orifices. In addition, a simple mathematical model is proposed to predict bubble frequency and bubble size in synchronous multi-orifice bubbling. Regimes of synchronous, alternative and unsteady bubbling were clearly identified, and the effects of orifice spacing and liquid depth on bubbling synchronicity and frequency were studied. The modified theoretical model for predicting synchronous bubble frequency in multi-orifice bubble formation works well. The predicted values of frequency under a variety of operating conditions agreed within A?15% with experimental data in the highly synchronous bubbling regime. These results should provide a sound basis for further fundamental studies into bubble formation phenomena at multiple orifices.