期刊
WATER ENVIRONMENT RESEARCH
卷 93, 期 10, 页码 2274-2297出版社
WILEY
DOI: 10.1002/wer.1604
关键词
bubble column; bubble size distribution; computational fluid dynamics; gas-liquid mass transfer; population balance model
资金
- Natural Sciences and Engineering Research Council of Canada [CRDPJ-488704-15, RGPIN-2017-04078]
The study used CFD-PBM model to simulate a bubble column reactor and validate the model against experimental data. The sensitivity analysis showed that the coalescence model of Prince and Blanch provided the best results, and the model was shown to be insensitive to the breakup model. The importance of considering bubble size distribution (BSD) for accurately modeling mass transfer was demonstrated.
Computational fluid dynamics (CFD) is used to simulate a bubble column reactor operating in the bubbly (homogenous) regime. The Euler-Euler two-fluid model, integrated with the population balance model (PBM), is adopted to compute the flow and bubble size distribution (BSD). The CFD-PBM model is validated against published experimental data for BSD, global gas holdup, and oxygen mass transfer coefficient. The sensitivity of the model with respect to the specification of boundary conditions and the bubble coalescence/breakup models is assessed. The coalescence model of Prince and Blanch (1990) provides the best results, whereas the output is shown to be insensitive to the breakup model. The CFD-PBM study demonstrates the importance of considering the BSD in order to correctly model mass transfer. Results show that the constant bubble size assumption results in a large error in the oxygen mass transfer coefficient, while giving acceptable results for gas holdup.
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