Abstract
The effects of the geometrical parameters of draft tubes and the clear liquid height on the average gas holdup EG in a 0.16 m I.D. bubble column for gas dispersion into the tubes were experimentally studied in an airtap water system. The gas holdup depended on the superficial gas velocity U(ING), the kinds of gas spargers, the diameter and length of the draft tubes, clearance Cb between the lower end of the draft tube and the bottom of the bubble column, and the clear liquid height HL. EG increased with decreasing hole diameter of the gas sparger at a small gas velocity UG, but did not depend on the kinds of gas spargers at a large UG. EG decreased with increasing clear liquid height HL. The effect of HL on EG was well expressed by the modified three-region model. The experimental data of EG were correlated.
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