Behavior of gas bubbles in a concentric cylindrical airlift column |
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Authors: | Keun Ho Choi Won Kook Lee |
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Affiliation: | (1) Department of Chemical Engineering, Taejon National University of Technology, 305, Samsung-dong, Dong-gu, 300-172 Taejon, Korea;(2) Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusung-gu, 305-701 Taejon, Korea |
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Abstract: | Using a light transmission optical probe, the effect of superficial gas velocity on bubble properties(bubble size, bubble
rising velocity, bubble frequency and local gas holdup) at axial and radial positions was determined in the riser and the
downcomer of a concentric cylindrical airlift reactor. The vertical bubble length, the bubble rising velocity and the bubble
frequency at axis in the riser increased with increasing superficial gas velocity and the bed height. The radial distribution
of the local gas holdup, vertical bubble length and bubble frequency in the riser and the downcomer were found to be non-uniform.
The profiles of the local gas holdup, vertical bubble length and bubble rising velocity in the riser were shown as parabolic
shapes. The local gas holdup, the vertical bubble length and the bubble frequency in the downcomer changed with superficial
gas velocity and the distance from the top of the draft tube. |
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Keywords: | |
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