velocity on bubble diameter, reported for the range of bubble sizes encountered in our
work (Valentin, 1967). The increase of gas holdup due to longer residence time of
smaller bubbles in the bed was thus less pronounced than the increase of interfacial area
corresponding to the smaller size of bubbles. The secondary gas dispersion in
sectionalised bubble columns thus has obviously even more positive effect on the extent
of interfacial area and thus consequently on kLaL values than on gas holdup (bubble bed
voidage).
Energy Effectiveness of Gas-Liquid ContactingIt has been proved for gas-liquid reactors that for each particular mode of phases
contacting and corresponding reactor type, there is an unambiguous relation between the
New methodologies for multiphase bioreactors 1 15