Discussion
An operator proposes a wider stack to reduce fan power. This is
Answer: B
Correct answer: Risky, since the lower exit velocity invites downwash
At constant flow a wider stack means a lower exit velocity. Once that falls below about 1.5 times the wind speed the plume is drawn into the stack’s wake, effective height collapses, and ground-level concentrations rise - a poor exchange for the fan power saved.
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