Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?
Correct answer: A. 1.5-2.5
- A. 1.5-2.5
- B. 3.5-5.5
- C. 7.5-10.0
- D. 10-15
Explanation
Rotary dryers are commonly designed with about 1.5 to 2.5 transfer units, even though their length-to-diameter ratio is typically 4 to 10. A very high NTU would generally require excessive dryer length and cost.
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