Effect of orifice submergence on bubble formation

The effect of orifice submergence on bubble formation was experimentally st udied. Four orifices were used of a diameter equal to 0.115, 0.210, 0.325 a nd 0.435 cm. Air was used as the gas phase and water as the liquid phase. E xperiments were conducted in the range of gas flaw rates 0.75-56.7 cm(3)/s, chamber volumes 150-7000 cm(3) and orifice submergence 10-150 cm. Results show that in the region of single bubble formation the bubble size increase s with the orifice submergence. In the region of group formation of bubbles the individual bubble size is independent of the orifice submergence, rang ing from 0.1 to 0.5 cm(3) for the smallest orifice and from 0.2 to 1 cm(3) for the other ones. No effect of orifice submergence was observed on weepin g.