Gas Holdup in Bubble Column with Draft Tube for Gas Dispersion into Annulus

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The effect of kind of gas sparger, outer diameter Do and length Ld of draft tube, lower clearance, superficial gas velocity and clear liquid height HL on gas holdup εG in a 0.16 m I.D. bubble column with a draft tube for gas dispersion into the annulus and for an air-water system was experimentally studied.εG depended on the kind of gas sparger in the range of φ ≤ 0.713, but hardly depends on them at φ = 0.875. φ is the ratio of (Do/DT) and DT is the inner diameter of the bubble column.At a given HL and in the range of φ ≤ 0.713, εG hardly depends on φ and Ld. But εG decreases clearly with increasing Ld at φ = 0.875.εG decreases with increasing HL. The effect of HL is well expressed by the modified three-region model.The experimental data for εG is correlated.
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