Pressure fluctuations and bubble size in viscous three-phase circulation fluidized bed bioreactors |
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Authors: | Sung Mo Son Ik Sang Shin Suk Hwan Kang Yong Kang Sang Done Kim |
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Affiliation: | (1) School of Chemical Engineering, Chungnam National University, Daejeon, 305-764, Korea;(2) Department of Biomolecular & Chemical Engineering, KAIST, Daejeon, 305-701, Korea |
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Abstract: | Characteristics of pressure fluctuations and bubble size were investigated in the riser of a three-phase circulation fluidized
bed bioreactor with viscous liquid medium, whose diameter is 0.102 m (ID) and 3.5 m in height. Effects of gas (0.01–0.07 m/s)
and liquid (0.17–0.23 m/s) velocities and liquid viscosity (0.96–38 mPa·s) on the bubble size in the riser were examined.
The bubbling phenomena in the bioreactor with viscous liquid medium were interpreted effectively by measuring and analyzing
the pressure fluctuations by adopting chaos theory. The bubble size increased with increasing gas velocity or liquid viscosity,
but decreased with increasing liquid velocity. The bubbling phenomena became more complicated and bubble size distribution
tended to broad, with increasing gas velocity or liquid viscosity. The bubble size was well correlated in terms of correlation
dimension of pressure fluctuations as well as dimensionless groups within these experimental conditions. |
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Keywords: | Pressure Fluctuations Viscous Bioreactor Bubble Size Three-phase Circulation Chaos Analysis |
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