A model, which is expressed in terms of eddy diffusivity, is developed in this paper for application to liquid-phase-controlled mass transfer in falling films. The eddy diffusivity used in the model is empirically related to the hydrodynamics in thin films in such a way that the eddy diffusivity is affected by both surface tension and viscosity of the liquid, which results in incorporating most of the features of the Lamont and Levich-Davies models into the proposed model. The proposed model was tested by using it to correlate published data for absorption of CO2, 02, H2, and He into water in wetted wall columns. Except for surface tension, the published data represent large ranges in the important variables. The proposed model correlates the data within experimental error and is consistent with the postulate that eddy diffusivity increases gradually with distance from the interface.
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