In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________?
Correct answer: A. Decreases
- A. Decreases
- B. Increases
- C. Is not affected
- D. May increase or decrease; depends on the feed
Explanation
Raising the liquor level in a vertical-tube evaporator increases the liquid head and generally weakens circulation, so the overall heat-transfer coefficient decreases. Lower circulation reduces the renewal of heated liquid at the tube surface.
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