In case of a vertical tube evaporator, with increase in the liquor level, the ____________ is increased?
Correct answer: D. Neither A. and B.
- A. Velocity of circulation
- B. Liquor-film co-efficient
- C. Both A. and B.
- D. Neither A. and B.
Explanation
Raising the liquor level increases the static head over the heated tubes, which suppresses boiling and natural circulation. The circulation velocity and the resulting liquor-film coefficient therefore do not increase.
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