Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Characteristics of Bubble Flow Behavior in a Gas-liquid Countercurrent Bubble Column Bioreactor

기-액 향류 흐름 기포탑 생물 반응기에서 기포 흐름 거동 특성

  • Son, Sung-Mo (School of Chemical Engineering, Chungnam National University) ;
  • Kang, Suk-Hwan (School of Chemical Engineering, Chungnam National University) ;
  • Lee, Chan-Gi (School of Chemical Engineering, Chungnam National University) ;
  • Jung, Sung-Hyun (School of Chemical Engineering, Chungnam National University) ;
  • Kang, Yong (School of Chemical Engineering, Chungnam National University) ;
  • Kim, Sang-Done (Department of Biomolecular & Chemical Engineering, KAIST)
  • 손성모 (충남대학교 화학공학과) ;
  • 강석환 (충남대학교 화학공학과) ;
  • 이찬기 (충남대학교 화학공학과) ;
  • 정성현 (충남대학교 화학공학과) ;
  • 강용 (충남대학교 화학공학과) ;
  • 김상돈 (한국과학기술원 생명화학공학과)
  • Received : 2004.07.29
  • Accepted : 2005.01.10
  • Published : 2005.04.30
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Abstract

Characteristics of bubbling behavior and bubble properties were investigated in a gas-liquid countercurrent bubble column of in diameter 0.152 m and 3.5 m in height, respectively. Effects of gas and liquid velocities and bubble distribution mode(even, wall-side, central or asymmetric distribution) on the bubble properties such as chord length, frequency, rising velocity and holdup in the reactor were measured and examined by means of dual resistivity probe method. The bubble size, frequency and holdup increased with increasing gas($U_G$) or liquid velocity($U_L$). The rising velocity of bubbles increased with increasing $U_G$, whereas decreased with increasing $U_L$. The uniformity of bubble size distribution and bubble holdup decreased when the distribution mode of bubbles at the gas distributor was changed from even to wall-side, central or asymmetric. The central distribution of bubbles was better than asymmetric mode but worse than wall-side distribution, in considering the bubble holdup and uniformity of distribution.

직경이 0.152 m이고 높이가 3.5 m인 기-액 향류 흐름 기포탑에서 기포의 물성과 흐름의 거동을 고찰하고 진단하였다. 기체와 액체의 유속 그리고 기포의 분산형태(even, wall-side, central or asymmetric distribution)가 반응기 내부에서 기포의 크기, 빈도수, 상승속도와 체류량 등 기포특성에 미치는 영향을 이중 전기 저항 탐침법을 이용하여 측정 검토하였다. 기포의 크기, 빈도수와 체류량은 기체나 액체 유속의 증가에 따라 증가하였다. 기포의 상승속도는 기체 유속의 증가에 따라 증가하였지만, 액체 유속의 증가에 따라서는 감소하였다. 기포 크기 분포의 균일성이나 체류량은 기포 분산판에서 기포의 분산형태가 균일분포에서 벽면, 중앙 그리고 비대칭 분산으로 변화함에 따라 감소하였다. 기포의 체류량과 분포에 대한 균일성을 고려하면, 기포의 중앙 분산 형태가 비대칭 분산 형태보다는 유리하며, 벽면 분산형태분산보다는 좋지 않았다.

Keywords

References

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