Stochastic modelling of axial dispersion in external-loop airlift bioreactors |
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| Authors: | M. Gavrilescu O. Muntean R. Z. Tudose |
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| Affiliation: | (1) Department of Chemical Engineering, Ryerson University, Toronto, ON, Canada, M5B 2K3;(2) Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada, N6A 5B8 |
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| Abstract: | The paper presents a model of the motion of a particle subjected to several transport processes in connection with mixing in two phase flow. A residence time distribution technique coupled with a one-dimensional dispersion model was used to obtain the axial dispersion coefficient in the liquid phase, Dax. The proposed model of Dax for an external-loop airlift bioreactor is based on the stochastic analysis of the two-phase flow in a cocurrent bubble column and modified for the specific flow in the airlift reactor. The model takes into account the riser gas superficial velocity, the riser liquid superficial velocity, the Sauter bubble diameter, the riser gas hold-up, the downcomer-to-riser cross sectional area ratio. The proposed model can be applied with an average error of ᆨ. |
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