Pjm. Lebens et al., Gas-liquid mass transfer in an internally finned monolith operated countercurrently in the film flow regime, CHEM ENG SC, 54(21), 1999, pp. 5119-5125
Gas-liquid mass transfer has been determined in internally finned monoliths
(IFM) by desorbing oxygen from a falling water film. Measurements were per
formed for various monolith lengths to quantify the inlet effects caused, a
mong others, by the development of the concentration profile. The local vol
umetric mass transfer coefficients were found to vary from approximately 0.
04 (s(-1)) at the inlet to about 0.01 (s(-1)) in the downstream sections. A
theoretical model has been derived, assuming that the water flow can be tr
eated as a film falling down in a corner. By averaging the radial mass tran
sfer perpendicular to the film surface, mass transfer can be predicted with
in reasonable accuracy. On comparing the film in the IFM with a film along
a vertical plane, it was found that in an IFM the concentration profile dev
elops faster while mass transfer is less effective in the developed section
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