Annular jets—II Gas absorption

A theoretical equation has been derived for the rate of liquid phase-controlled gas absorption by an annular jet. It has been confirmed by measurements of the absorption rate of CO2 in annular jets of water.The annular jet has also been used to determine molecular diffusivities of sparingly soluble gases (O2, H2, N2, He, A, C2H6, C2H4) in water. The diffusivities found in this way are about 80 per cent of those found using a wetted-sphere apparatus. It is tentatively concluded that the apparent lowering of diffusivity in the annular jet is due to an interfacial resistance to the absorption of sparingly soluble gases. The absorption on the wetted sphere is unaffected by interfacial resistance because of the relatively large diffusional resistance associated with the longer exposure time in this case. The molecular diffusivities as found by the wetted-sphere method agree fairly well with other data.