Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/66613
Title: Hydrodynamic behaviour in a new gas-liquid-solid inverse fluidization airlift bioreactor
Authors: Han, S.J. 
Tan, R.B.H. 
Loh, K.C. 
Keywords: Airlift reactor
Gas holdup
Inverse fluidized bed
Liquid circulation velocity
Liquid-solid bed expansion
Issue Date: Dec-2000
Source: Han, S.J.,Tan, R.B.H.,Loh, K.C. (2000-12). Hydrodynamic behaviour in a new gas-liquid-solid inverse fluidization airlift bioreactor. Food and Bioproducts Processing: Transactions of the Institution of of Chemical Engineers, Part C 78 (4) : 207-215. ScholarBank@NUS Repository.
Abstract: A gas-liquid-solid inverse fluidization airlift bioreactor was proposed by combining advantages of external-loop airlift reactors and inverse fluidized beds. This airlift bioreactor comprises a gas-liquid riser, a gas separator, a liquid-solid inverse fluidized downcomer and a bottom connector. The effects of the gas velocity and the particle loading on the gas holdup in the riser and the liquid circulation velocity in the loop were investigated. Liquid-solid inverse fluidization in the downcomer was also studied. The gas holdup in the riser was experimentally found to increase with the increase in the particle loading and in the gas velocity. The liquid circulation velocity decreased with the increase in the particle loading whereas it increased with the gas velocity. It was found that the Richardson and Zaki model fitted experimental data of bed expansion of liquid-solid inverse fluidization in the downcomer well. Based on an energy balance, two hydrodynamic models were proposed to predict the liquid circulation velocity in the present bioreactor. It was shown that the present models gave a good fit to experimental data in this bioreactor.
Source Title: Food and Bioproducts Processing: Transactions of the Institution of of Chemical Engineers, Part C
URI: http://scholarbank.nus.edu.sg/handle/10635/66613
ISSN: 09603085
Appears in Collections:Staff Publications

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