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Size Verification of Small and Large Bubbles in a Bubble Column

기포탑에서 작은기포와 큰기포의 크기 구별

  • Seo, Myung Jae (School of Chemical Engineering, Chungnam National University) ;
  • Jin, Hae-Ryong (School of Chemical Engineering, Chungnam National University) ;
  • Lim, Dae Ho (School of Chemical Engineering, Chungnam National University) ;
  • Lim, Ho (School of Chemical Engineering, Chungnam National University) ;
  • Kang, Yong (School of Chemical Engineering, Chungnam National University) ;
  • Jun, Ki-Won (Green Chemical Technology Division, Korea Research Institute of Chemical Technology)
  • 서명재 (충남대학교 화학공학과) ;
  • 진해룡 (충남대학교 화학공학과) ;
  • 임대호 (충남대학교 화학공학과) ;
  • 임호 (충남대학교 화학공학과) ;
  • 강용 (충남대학교 화학공학과) ;
  • 전기원 (한국화학연구원)
  • Received : 2011.08.26
  • Accepted : 2011.09.30
  • Published : 2012.04.01

Abstract

Size verification of small and large bubbles in a bubble column was investigated by employing the dynamic gas disengagement (DGD) method and dual electrical resistivity probe (DRP) method, simultancously. The holdups of large and small bubbles in the bubble column in a given operating condition were obtained by means of the DGD method by measuring the pressure drop variation in the column with a variation of time after stopping the gas input into the column. The size and frequency of bubbles were measured by the DRP method in the same operating condition, from which the bubble holdup of each range of size was obtained. The verification of size in determining the large or small bubbles was decided by comparing the holdups of large or small bubbles measured by the DGD method with that measured by the DRP method. Filtered compressed air and tap water were used as a gas and a continuous liquid medium. The diameter and height of the bubble column were 0.102 m and 1.5 m, respectively. The demarcation size between the large and the small bubbles in the bubble column was 4.0~5.0 mm; the demarcation size was about 5.0 mm when the gas velocity was in the relatively low range, but about 4.0 mm when the gas velocity was in the relatively high range, within this experimental conditions.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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