LIMITING STAGES IN MASS-TRANSFER OPERATIONS WITH THIN-FILM FLOWS

It is shown that the throughputs of stages in which material is suppli ed to the working zone of a mass-transfer apparatus and in which it is removed from the zone should be taken into account in predicting the rate of mass-transfer processes. The rate of mass transfer from a liqu id film for film mass-transfer apparatuses is studied. An approach bas ed on theoretical analysis is proposed to estimate the boundaries betw een the stream-controlled and mixed problems. The experimental data av ailable in the Literature are used to confirm the stream-controlled be havior of mass transfer in laminar films and to verify the theoretical ly predicted boundaries between the stream-controlled and mixed proble ms.