Abstract
The critical operation condition for complete countercurrent flow may be extended by enlarging the bottom of the bubble column. Several cylindrical enlarged sections of different diameter and length were examined and the critical liquid velocities were measured.It was found that the critical liquid velocity increased with increasing diameter or length of the enlarged section. An experimental equation for the critical liquid velocity was deduced.Higher gas holdup and liquid-phase overall mass transfer coefficient were obtained in the bubble column with enlarged bottom and correlating equations were derived.
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