화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.24, No.5, 866-871, September, 2007
DOI10.1007/s11814-007-0056-0  Export Citation
Pressure fluctuations and bubble size in viscous three-phase circulation fluidized bed bioreactors
Sung Mo Son, Ik Sang Shin, Suk Hwan Kang, Yong Kang†, and Sang Done Kim1
  • School of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea
  • 1Department of Biomolecular & Chemical Engineering, KAIST, Daejeon 305-701, Korea
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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 (0.17-0.23m/s) velocities and liquid viscosity (0.96-38mPa·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.
Keywords:Pressure Fluctuations;Viscous Bioreactor;Bubble Size;Three-phase Circulation;Chaos Analysis
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