Mass transfer from single bubbles in aqueous solutions of surfactants

Abstract

The constant volume technique developed by Calderbank has been used to measure mass transfer rates for single carbon dioxide bubbles (0.52 < d o < 1.02 cm) in distilled water and in aqueous solutions of n-hexanol, n-heptanol and n-octanol. The addition of surfactants to water reduced the mass transfer coefficient. A model to estimate the mass transfer coefficient in aqueous solutions of surfactants has been proposed, where the effect of surfactants has been expressed by introducing the retardation coefficient which indicates the degree of the retardation of surface flow at the gas—liquid interface.