Discussion
Plume rise from a cold stack with high exit velocity is dominated by
Answer: C
Correct answer: Momentum
A cold stack has no thermal buoyancy to draw on, so whatever rise it achieves comes from the momentum of the issuing jet - the vertical velocity with which the gas leaves. In Holland’s formula that term goes as \(v_s d / u\), so it can be increased by raising exit velocity or reduced by a strong wind.
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