Discussion
Stack tip downwash occurs when
Answer: D
Correct answer: Exit velocity is low against wind speed
Stack tip downwash occurs when the gas leaves too slowly relative to the wind. The wind separates round the stack and leaves a low-pressure wake immediately downwind, and a slow plume is drawn into it instead of rising - so the effective stack height falls, sometimes to the physical height or below. Specifying an exit velocity of at least about 1.5 times the design wind speed is what prevents it.
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