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        Flow Regimes in a Two Phase Reversed Flow Jet Loop Bioreactor

        Sameer M. Wagh,Kishore V. Koranne,Raju B. Mankar,Ram L. Sonolikar 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.3

        Reversed flow jet loop bioreactors (RFJLB)have been used extensively for 2 or 3 phase biochemical reactions. From visual observations and gas holdup data, 3distinct flow regimes are identified in RFJLB, namely: (1)Bubble free regime (BFR), where bubbles are observed in the draft tube only; (2) Transition regime (TR), where bubbles are observed in both the draft tube and the annulus,but without circulation; and (3) Complete bubble circulation regime (CBCR), where bubbles circulate in both the draft tube and annulus. CBCR is the most desirable regime,since the reactor operation in this regime gives a higher gas holdup and mass transfer rate than in the other two regimes. In the present study, the hydrodynamic behavior of RFJLB was investigated under various operational and geometrical conditions, such as gas and liquid velocity and nozzle configuration. Factors affecting the critical liquid circulation velocity (CLCV) above which the CBCR is established were identified and evaluated quantitatively.

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