Discussion
Reducing stack diameter at constant volumetric flow
Answer: C
Correct answer: Raises velocity but also draught loss
At constant volumetric flow, velocity is \(Q/A\), so a smaller bore means a higher exit velocity - more momentum rise and less risk of downwash. But the pressure loss through the stack rises roughly with the square of velocity, so the fan must work harder. The diameter is therefore a compromise between dispersion and running cost.
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