Abstract
In the tracer impulse method using only a conductivity probe, the more recommendable calculation method for the circulation liquid velocity was suggested, which decreased the errors resulted from the response time. The effects of the horizontal connection length (0.1≤L≤0.5 m), the cross-sectional area ratio of downcomer-to-riser (0.11≤Ad/Ar≤0.53), and the superficial gas velocity (0.02≤UG≤0.18 m s1) on the circulation liquid velocity were studied. The horizontal connection length as well as UG, and Ad/Ar, had a significant effect on the circulation liquid velocity. The circulation liquid velocity increased with increasing Lc.
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References
Bello, R. A.,“A Characterization Study of Airlift Contactors for Application to Fermentation”, Ph.D. Thesis, University of Waterloo, Ontario, Canada (1981).
Bello, R. A., Robinson, C. W. and Moo-Young, M., “Liquid Circulation and Mixing Characteristics of Airlift Contactors”,Can. J. Chem. Eng.,62, 573 (1984).
Chakravarty, M., Singh, H. D., Baruah, J. N. and Iyengar, M. S., “Liquid Velocity in a Gas-Lift Column”,Ind. Eng. Chem.,16, 17 (1974).
Chisti, M. Y. and Moo-Young, M.,“Fermentation Technology, Bioprocessing, Scale-Up and Manufacture”, Biotechnology: The Science and the Business, Moses and Cape, eds., Harwood Academic Publisher, New York, 1991.
Chisti, M. Y., Halard, B. and Moo-Young, M., “Liquid Circulation in Airlift Reactors”,Chem. Eng. Sci.,43, 451 (1988).
Chisti, Y., Wenge, F. and Moo-Young, M.,“Relationship between Riser and Downcomer Gas Hold-Up in Internal-Loop Airlift Reactors without Gas-Liquid Separators”,Chem. Eng. J.,57, B7 (1995).
Choi, K. H. and Lee, W. K.,“Circulation Liquid Velocity, Gas Holdup and Volumetric Oxygen Transfer Coefficient in External-Loop Airlift Reactors”,J. Chem. Tech. Biotechnol.,56, 51 (1993).
Choi, K. H., Chisti, Y. and Moo-Young, M.,“Influence of the Gas-Liquid Separator Design on Hydrodynamic and Mass Transfer Performance of Spilt-Channel Airlift Reactors”,.J. Chem. Tech. Biotechnol.,62, 327 (1995).
Fan, L. S., Hwang, S. J. and Matsuura, A., “Hydrodynamic Behaviour of a Draft Tube Gas-Liquid-Solid Spouted Bed”,Chem. Eng. Sci.,39, 1677 (1984).
Fields, P. S., Mitchell, F. R. G. and Slater, N. K. H.,“Studies of Mixing in a Concentric Tube Air-Lift Reactor Containing Xanthan Gum by Means of an Improved Flow Follower”,Chem. Eng. Comm.,25, 93 (1984).
Herskowitz, M. and Merchuk, J. C.,“A Loop Three-Phase Fluidized Bed Reactor”,Can. J. Chem. Eng.,64, 57 (1986).
Hiyahara, T., Hamaguchi, M., Sukeda, Y. and Takahashi, T.,“Size of Bubbles and Liquid Circulation in a Bubble Column with a Draught Tube and Sieve Plate”,Can. J. Chem. Eng.,64, 718 (1986).
Kemblowski, Z., Przywarski, J. and Diab, A.,“An Average Gas Hold-Up and Liquid Circulation Velocity in Airlift Reactors with External Loop”,Chem. Eng. Sci.,23, 4023 (1993).
Jones, A. G.,“Liquid Circulation in a Draft-Tube Bubble Column”.Chem. Eng. Sci,40, 449 (1985).
Jose, M. S. and Merchuk, J. C.,“Hydrodynamics in Rectangular Air-Lift Reactors: Scale-Up and the Influence of Gas-Liquid Separator Design”,Can. J. Chem. Eng,69, 465 (1991).
Li, G. Q., Yang, S. Z., Cai, Z. L. and Chen, J. Y.,“Mass Transfer and Gas-Liquid Circulation in an Airlift Bioreactor with Viscous Non-Newtonian Fluids”,Chem. Eng J.,56, B 101 (1995).
Lippert, J., Adler. I., Meyer, H. D. and Lubbert, A.,“Characterization of the Two-Phase Systems in Airlift Tower-Loop Bioreactors During the Cultivation ofE. coll.”,Biotechnol. Biocng.,25, 437 (1983).
Livingston, A. G. and Zang, S. F., “Hydrodynamic Behaviour of Three-Phase (Gas-Liquid-Solid) Airlift Reactors”,Chem. Eng. Sci.,48, 1641 (1993).
Lu, W. J., Hwang, S. J. and Chang, C. M.,“Liquid Velocity and Gas Holdup in Three-Phase Internal Loop Airlift Reactors with Low-Density Particles”,Chem. Eng. Sci.,50, 1301 (1995).
Mercer, D. G., “Flow Characteristics of a Pilot-Scale Airlift Fermentor”,Biotechnol. Bioeng. 23, 2421 (1981).
Merchuk, J. C. and Stein, Y.,“Local Hold-Up and Liquid Velocity in Air-Lift Reactors”,AlChE. J.,27, 377 (1981).
Merchuk, J. C.,“Gas Hold-Up and Liquid Velocity in a Two-Dimensional Air Lift Reactor”,Chem. Eng. Sci.,41, 11 (1986).
Popovic, M. and Robinson, C. W., “External-Circulation-Loop Airlift Bioreactors: Study of the Liquid Circulating Velocity in Highly Viscous Non-Newtonian Liquid”,Biotechnol. Bioeng.,32, 301 (1988).
Popovic, M. and Robinson, C. W.,“The Specific Interfacial Area in External-Circulation-Loop Airlifts and a Bubble Column-I. Aqueous Sodium Sulphite Solution”.Chem. Eng. Sci.,42, 2811 (1987).
Shamlou, P. A., Pollard, D. J., Ison, A. P. and Lilly, M. D., “Gas Holdup and Liquid Circulation Rate in Concentric-Tube Airlift Bioreactors”,Chem. Eng. Sci.,49, 303 (1994).
Siegel, M. H., Merchuk, J. C. and Schugerl, K., “Air-Lift Reactor Analysis: Interrelationships between Riser, Downcomer, and Gas-Liquid Separator Behavior, Including Gas Recirculation Effects”,AIChE. J.,32, 1585 (1986).
Verlaan, P., Tramper, J. and Riet, K. V.,“A Hydrodynamic Model for an Airlift-Loop Bioreactor with External Loop”,Chem. Eng. J.,33, B43 (1986).
Wachi, S., Jones, A. G. and Elson, T. P., “Flow Dynamics in a Draft-Tube Bubble Column Using Various Liquids”,Chem. Eng. Sci.,46, 657 (1991).
Weiland, P., “Influence of Draft Tube Diameter on Operation Behaviour of Airlift Loop Reactors”,Ger. Chem. Eng.,7, 374 (1984).
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Choi, K.H. Circulation liquid velocity in external-loop airlift reactors. Korean J. Chem. Eng. 13, 379–383 (1996). https://doi.org/10.1007/BF02705965
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DOI: https://doi.org/10.1007/BF02705965