Abstract
Mass transfer coefficients were measured in three concentric-tube airlift reactors of different scales (RIMP, V L =0.07 m3;RIS−1,V L =2.50 m3;RIS−2, V L =5.20 m3). The effects of top and bottom clearance and flow resistances at downcorner entrance were studied in water-air system. Experimental results show that h s ,h B and A d /A R ratio affect K L a values as a result of their influence on gas holdup and liquid velocity. The gas-liquid mass-transfer coefficients for all the geometric variables were successfully correlated as Sherwood number with Froude and Galilei numbers, the bottom spatial ratio (B=h B /D R ), the top spatial ratio , the gas separation ratio and the downcomer flow resistance ratio (R=A d /A R ). The proposed empirical model satisfactorily fitted the experimental data obtained in large airlift reactors and some data presented in literature.
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Received: 11 August 1997
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Gavrilescu, M., Tudose, R. Concentric-tube airlift bioreactors . Bioprocess Engineering 19, 175–178 (1998). https://doi.org/10.1007/s004490050502
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DOI: https://doi.org/10.1007/s004490050502