Experimental study and parameterization of interfacial gas absorption

Abstract

Experiments of simultaneous absorption of carbon dioxide and helium, in transient absorption regimes, have been carried out in a gasliquid flume for stratified-type cocurrent flows. There was a need to improve a method of chromatographic analysis for helium and CO, titrations in the gaseous phase and the liquid phase; this led us to study simultaneous absorption of CO, and He independent of dynamic conditions. In addition the dominant wave characteristics were studied and the interfacial friction velocity was measured. It was confirmed that, for two gases presenting a large contrast in diffusivities, gas absorption rates are related directly to the physical properties of the gases. The mass transfer coefficient varies with the -1 / 2 exponent of the Schmidt number for a large interfacial stress and a clean interface whereas it varies with the -2 / 3 exponent for weaker winds.

Experimental study and parameterization of gas absorption by water drops

“…(3) The Schmidt number is fairly well related with the masstransfer coefficient. This has been confirmed in studying simultaneously absorption of carbon dioxide and helium, two gases presenting a large contrast of molecular diffusivity (Caussade et al, 1990).…”

“…(1) Most absorption models proposed that the mass-transfer coefficient varies with -1/2 exponent of the Schmidt number (Levich, 1962;Fortescue and Pearson, 1967;Davies, 1972;Ueda et al, 1977;Henstock and Hanratty, 1979). Recently, Jahne et al (1987) and Caussade et al (1990) showed that the Schmidt number exponent is equal to -1/2 for rather strong interfacial stress and a clean interface whereas it is equal to -2/3 when the interface resembles a wall.…”

“…(1) The interfacial friction velocity which is well correlated with the absorption coefficient (Caussade et al, 1990).…”

“…(2) The characteristic length scales of the waves near the sheared interface: interfacial roughness (Tsacoyannis, 1976); wavelength (Baleix, 1984); and interfacial-level fluctuations (Caussade et al 1990).…”

Absorption et désorption du dioxyde de souffre par des gouttes d'eau de fort diamètre en chute.

“…Ce coefficient a été étudié dans des configurations variées: écoulements de jets, écoulements de bulles, film tombant, cuves agitées, écoulements en canal (THEOFANOUS (1976)). Dans ces conditions, les modèles locaux d'absorption (AlSA et al (1981); CAUSSADE et al (1990)) expriment le coefficient de transfert k, en fonction des paramètres suivants:…”