Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?
Correct answer: B. K ∝√D
- A. K ∝D
- B. K ∝√D
- C. K ∝D1.5
- D. K ∝D2
Explanation
Penetration theory gives a transient diffusion-layer thickness proportional to the square root of Dt, so the mass-transfer coefficient varies as D divided by that thickness. Consequently, K is proportional to √D.
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