This experimental study is aimed at investigating the effect of superficial gas
velocity, liquid phase properties and gas distribution on gas holdup, bubble
characteristics and drag coefficient in two-phase bubble column. Various liquids
covering a sufficiently broad range of viscosity and surface tension values were
employed, while the gas phase was atmospheric air. Aqueous glycerine solutions were
used to simulate the behavior of coalescing viscous liquids whereas aqueous alcohol
solutions were used to simulate the behavior of non-coalescing organic liquids. The
experimental results obtained with two different types of gas distributor in the
coalescence solutions and in non coalescence solutions were compared with data on
standard air–water system. A computerized conductivity probe system and high speed
digital camera were used for the systematic measurements of bubble size, velocity and
gas hold-up. Correlations based on dimensionless groups were proposed for the
prediction of gas holdup and drag coefficient in the homogeneous flow regime.