Onset of Rayleigh−Bénard−Marangoni Convection in Gas−Liquid Mass Transfer with Two-Phase Flow: Comparison of Measured Results with Theoretical Results

Abstract

Experimental results of the critical points of the Rayleigh and Marangoni instabilities in absorption and desorption of carbon dioxide into and from organic solvents have been compared with theoretical results obtained using a theoretical linear stability analysis in which the effect of nonlinear velocity profiles and nonlinear concentration profiles of fluid flows and the effect of the Gibbs adsorption layer have been considered. The comparison shows that, when the surface viscosity number of the Gibbs adsorption layer is ignored, the calculated values of the critical concentration difference are in satisfactory agreement with the measured data for the absorption processes but are about 7- to 9-fold less than the measured data for the desorption processes. Using reasonably estimated values of the surface viscosity and surface dilational viscosity of the Gibbs adsorption layer, this difficulty has been solved. The calculated values of the critical concentration difference under different operating conditions show good agreement with the measured data.