Which is the controlling factor for a drum drier ?
Correct answer: B. Heat transfer
- A. Diffusion
- B. Heat transfer
- C. Both A. and B.
- D. Neither A. nor B.
Explanation
In a drum dryer, the wet material contacts a heated rotating drum and drying is mainly governed by the rate at which heat passes through the drum wall into the material. Diffusion may affect internal moisture movement, but heat transfer is the controlling factor here.
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