Liquid holdup
The liquid holdup is an important parameter especially for determining the values of kLaGL and the frictional pressure
drop, Pf . The typical flow regimes in an upflow co-current column are the spray-, bubble-, and pulse regimes. The values
for the liquid holdup were determined in the experimental setup comparing the amount of liquid in the gas–liquid separator for a 0.3 and a 0.6m column. The difference in the measured liquid volumes being the additional liquid holdup in the column at specific gas and liquid flow rates.