Gas holdup in laboratory scale bubble column : CFD simulations vs. measurements

Experiments Experimental column width was 20 cm, measurements were done for column thickness 4 and 10 cm. Ungassed liquid height was 25 and 50 cm. Water and air were used as liquid and gas phase. Gas distributor consisted of one line of 33 orifices (0.5 mm orifice diameter, 5 mm distance between two neighbouring orifices). Experiments were done for air flow rates 800, 1200 and 1800 l/h. Gas holdup profiles were measured at height 11, 21, 31 and 41 cm above the gas distributor. There were 19 measuring points in horizontal profile with distance 1 cm. Local gas holdup at each point was measured for 2 minutes the obtained values are 2 min time averages.