FIGURE 4 Images of microbubbles formed at different lengths of
ceramic membranes: (A) 5 cm, (B) 10 cm, (C) 15 cm, and (D) 20 cm. Liquid
flow rate: 1.0 ml/min and gas flow rate: 10 ml/min
FIGURE 5 Effects of lengths of ceramic membranes on the average
bubble diameter