Spatial Scale Effects on Rayleigh Convection and Interfacial Mass Transfer Characteristics in CO sub(2) Absorption

Concentration gradient-induced Rayleigh convections in the CO sub(2) absorption process were investigated by the hybrid Lattice-Boltzmann/finite-difference method (LBM-FDM). The spatial scale effects on Rayleigh convection were studied by simulating Rayleigh convections with different liquid layers....

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Bibliographic Details
Published in:Chemical engineering & technology 2015-01, Vol.38 (1), p.23-32
Main Authors: Guo, Kai, Liu, Chunjiang, Chen, Shuyong, Fu, Bo, Liu, Botan
Format: Article
Language:English
Subjects:
Assessments
Carbon dioxide
Convection
Finite difference method
Liquids
Mass transfer
Mathematical analysis
Scale effect
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Summary:Concentration gradient-induced Rayleigh convections in the CO sub(2) absorption process were investigated by the hybrid Lattice-Boltzmann/finite-difference method (LBM-FDM). The spatial scale effects on Rayleigh convection were studied by simulating Rayleigh convections with different liquid layers. The scale of convection increased with the liquid layer height but the average mass transfer coefficient showed the adverse tendency. The Rayleigh convection had a pronounced effect on the surface renewal. For better assessment of the renewal intensity, two statistical quantities were proposed. The transient variations of these quantities provided a good following feature with the mass transfer coefficient which confirms their accuracy and precision in characterizing the mass transfer process. Numerical investigation of concentration gradient-induced Rayleigh convection in CO sub(2) absorption with varying liquid layer height is performed based on the hybrid Lattice-Boltzmann/finite-difference method. Results indicate the temporal-spatial evolution of Rayleigh convection and interfacial mass transfer characteristics. Two statistical quantities are proposed for improved assessment of the renewal intensity.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201400335