Modeling of Rayleigh convection in gas–liquid interfacial mass transfer using lattice Boltzmann method

Modeling with statistical hydrodynamic quantities of mass transfer across gas–liquid interface with Rayleigh convection

“…For simplification, any disturbances are regarded as the perturbation incurred by concentration disturbances, and the random disturbance model [25] is applied to reflect the perturbations. The random distribution model assumes that the disturbances take place on the surface randomly at any position with a certain possibility and magnitude.…”

“…Fu's work [25], the parameters, possibility P' and the magnitude of concentration disturbance C D , have a proper range in which the calculation results will maintain roughly unchanged. Here, P'=0.05 and C D =0.001, are applied, which are suitable for the simulation of Rayleigh convection.…”

“…Fu et al [24] employed a two-equation LBM in the computational solution of velocity and concentration fields of Rayleigh convection, and an experimental measurement of the velocity field was conducted via PIV. Fu et al [25] proposed the random disturbance model to mimic actual interfacial disturbance, which is necessary for the onset of Rayleigh convection. Furthermore, Chen et al [26] developed a hybrid Lattice-Boltzmann/finite-difference method (LBM-FDM) to simulate the concentration gradient-induced interfacial convection in gas-liquid systems.…”

Spatial Scale Effects on Rayleigh Convection and Interfacial Mass Transfer Characteristics in CO2 Absorption

“…Therefore, for a gas absorption process, the nonuniform concentration distribution of the gas phase at the interface is regarded as the source of perturbation. To evoke the interfacial convection, the random disturbance model [33] is used in the simulation.…”

“…Fu et al [32] employed a twoequation LBM in the computational solution of velocity and concentration fields of Rayleigh convection caused by a concentration gradient, and an experimental measurement of velocity field via particle image velocimetry (PIV) was conducted to validate the simulated results. Fu et al [33] proposed the random disturbance model to simulate the interfacial disturbance which is known as one of the necessary conditions of Rayleigh convection onset. The model parameters were identified by comparison of the simulated critical onset time of Rayleigh convection with the experimental and theoretical values in literature.…”