Chapter 14: External Diffusion Effects on Heteregeneous Reactions
Self Test: Comparing JA and BA for diffusion through a stagnant film
WA = JA + WA
Concentration Profiles
EMCD:
Stagnant Film:
Fluxes
EMCD:
Stagnant Film:
In what regions (i.e., z/d) does JA dominate and in what regions does BA dominate?
Solution
also
when yA ~ 1 Ratio ~ 0 Bulk Flow Dominates
yA ~ 1 Molecular Diffusion Dominates
yA |
Ratio |
1 0.9 0.75 0.5 0.25 0.10 0 |
0 0.11 0.33 1 3 9
|