Gas-liquid flow in bubble columns and loop reactors: Part I. Detailed modelling and numerical simulation

被引:205
作者
Sokolichin, A. [1 ]
Eigenberger, G. [1 ]
机构
[1] Univ Stuttgart, Inst Chem Verfahrenstech, D-70199 Stuttgart, Germany
关键词
D O I
10.1016/0009-2509(94)00289-4
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The state of the art of the modelling of gas-liquid flow in bubble columns and loop reactors is critically reviewed. Recent results obtained with dynamic multidimensional two-fluid models are compared with respective steady state simulations. It will be shown that no steady state solution for uniformly aerated bubble columns can be obtained above a certain gas velocity if a sufficiently fine space grid is used. A dynamic state is obtained instead where large and rising vortices are subsequently generated at the gas distributor. Only after a long time averaging is the well known flow structure with increased gas hold-up and liquid upflow in the column centre and reduced gas hold-up with downflow near the walls obtained. The above results are based upon a two-dimension Euler-Euler model. The underlying assumptions and simplifications are discussed and the advantages and drawbacks of a corresponding Euler-Lagrangian formulation are considered. The model is used in Part II of this contribution for a detailed comparison with the experimental results from a flat bubble column with various circulating flow patterns.
引用
收藏
页码:5735 / 5746
页数:12
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