Chemical Engineering Research & Design, Vol.163, 182-191, 2020
A mesoscale method for effective simulation of Rayleigh convection in CO2 storage process
Rayleigh convection is an interfacial transport phenomenon in the CO2 capture and storage processes. In the present paper, we proposed a mesoscale model to capture the convection structure caused by Rayleigh convection in a 20 mm x 10 mm CO2 absorption cell with low mesh density. To close this mesoscale model, we analyzed the relationship between entropy generation caused by mass transfer and viscous dissipation, and raised a criterion. This criterion was also verified by a PIV/LIF quantitative experiment in CO2 absorption cell with Ra = 115 similar to 23 x 10(7). The proposed mesoscale method can prediction the concentration and velocity distributions of Rayleigh convection effectively. The relative error of total mass transfer flux can be decreased from 43% to 6.3%. The idea of this mesoscale method is promising for solving complicated transport problem that is difficult to find the conservation model. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.