Kozo Koide

Mass transfer from single bubbles in aqueous solutions of surfactants

The constant volume technique developed by Calderbank has been used to measure mass transfer rates for single carbon dioxide bubbles (0.52 <do < 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.

Entrainment and mass transfer at the density interface in a trough

Abstract A study was made on the entrainment and mass transfer at the density interface in a trough. The trough was located approximately in the middle of a channel 2.7 m long, 0.05 m wide and 0.04 m high. Six water-soluble chemicals were used to make solutions of denser fluids in the trough. The experimental results were summarized satisfactorily by empirical correlations in which an analytical interfacial velocity was introduced.