Discussion
Increasing the exit gas temperature at constant flow generally
Answer: B
Correct answer: Increases plume rise
A hotter gas is less dense than the surrounding air, so it is more buoyant and rises further before its temperature and the ambient temperature come together. In Holland’s formula the buoyancy term contains \((T_s - T_a)/T_s\), which grows with exit temperature. This is why flue gas cooled by a wet scrubber is often reheated.
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