Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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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?

Go to Solution





















































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






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