Discussion
Wind at stack height is \( 9 \) m/s. The minimum exit velocity to avoid stack tip downwash is
Answer: C
Correct answer: 13.5 m/s
The usual rule is an exit velocity of at least 1.5 times the wind speed at stack height:
\[ v_{min} = 1.5 \times 9 = 13.5\ \text{m/s} \]Below that the plume is liable to be drawn into the stack’s own wake.
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