Modelling of turbulent flow in a bubble column reactor

Ranade, V. V. (1997) Modelling of turbulent flow in a bubble column reactor Chemical Engineering Research and Design, 75 (1). pp. 14-23. ISSN 0263-8762

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A comprehensive mathematical model for describing flow, turbulence and gas hold-up distribution in a bubble column reactor is developed. For large diameter bubble columns (>0.1m), operated with the zero or low liquid throughput, sparged gas tends to pass preferentially through the central portion of the column. This non-uniform gas hold-up distribution leads to macroscale circulation and turbulence in the reactor. Two new mechanisms are proposed and modelled to explain such a non-uniform gas hold-up distribution in bubble columns. The influence of accompanying wakes and of the column wall on the motion of gas bubbles is accounted for for the first time. Turbulent, dispersed gas-liquid flow is described by the time averaged two phase momentum equations. The turbulent stresses are simulated using a k-ε model. Extra terms arising from the gas hold-up fluctuations and pressure gradients are included in the model. The predicted flow characteristics of the bubble column reactor are verified by comparison with the published experimental data over a wide range.

Item Type:Article
Source:Copyright of this article belongs to Institution of Chemical Engineers.
Keywords:Bubble column; turbulence; gas-liquid flow; CFD
ID Code:64708
Deposited On:17 Oct 2011 03:55
Last Modified:17 Oct 2011 03:55

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