According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?
Correct answer: A. D
- A. D
- B. D2
- C. D0.5
- D. 1/D
Explanation
In film theory, k is approximately D divided by the film thickness, k = D/δ, so it is directly proportional to molecular diffusivity. The D^0.5 dependence belongs to penetration and surface-renewal models, not the basic film model.
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