Page 50 - Modelling in Transport Phenomena A Conceptual Approach
P. 50
2.4. TOTAL FLUX 31
L Surface coated with species A
Figure 2.7 Solid dissolution into a falling film.
Calculate the rate of transfer of species A into the flowing liquid.
Solution
Assumptions
1. The total molar concentration in the liquid phase is constant.
2. In the x-direction, the convective flux is small compared to the molecular
flux.
Analysis
The molar rate of transfer of species A can be calculated from the expression
nA = iw 1" NA, lZ=o
