Enhancement and mechanism of adsorptive particles on gas-liquid interfacial mass transfer

Abstract

The aim of this paper is to study the enhancement mechanism of adsorptive particles on gas-liquid interfacial mass transfer. A quantitative model for predicting enhancement factor is proposed based on film model and interfacial non-equilibrium model, in which the enhancement factor depends mainly on the surface fractional coverage θ and the solute bulk concentration Cb, the interfacial concentration of liquid CI is dependent of the mass transfer coefficient kl and Cb, and usually is far from the equilibrium concentration with gas phase at the interface. The surface fractional coverage θ is a function of particle property and operating condition. The present model divided the enhancement into two regimes: particle-transport-controlled regime and surface-adsorption-controlled regime. The increase of gas-liquid mass transfer rate in the presence of adsorptive particles could mainly attributed to the surface adhesion of particles, the enhancement factor is an increasing function of surface fractional coverage θ but a decreasing function of the solute bulk concentration Cb, which well explains the effects of particles concentration and stirring intensity on enhancement factor. The prediction values of present model are at considerably good agreement with experimental data.