The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?
Correct answer: B. 10
- A. 100
- B. 10
- C. 5
- D. 1
Explanation
Penetration theory gives the liquid-side coefficient as proportional to the square root of the exposure frequency, and exposure frequency is proportional to liquid velocity or Reynolds number. A 100-fold Reynolds-number increase therefore gives a square-root, or 10-fold, coefficient increase.
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