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Spatial Scale Effects on Rayleigh Convection and Interfacial Mass Transfer Characteristics in CO 2 Absorption
Author(s) -
Guo Kai,
Liu Chunjiang,
Chen Shuyong,
Fu Bo,
Liu Botan
Publication year - 2015
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400335
Subject(s) - rayleigh scattering , mass transfer , lattice boltzmann methods , convection , mass transfer coefficient , rayleigh number , absorption (acoustics) , natural convection , intensity (physics) , chemistry , thermodynamics , mechanics , materials science , optics , physics , composite material
Concentration gradient‐induced Rayleigh convections in the CO 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.