Discussion
Arrange the components of effective stack height in the order they are established:
1. The physical stack height is fixed by the design
2. Momentum rise occurs as the gas leaves the stack
3. Buoyancy carries the plume further as it cools towards ambient
4. The plume levels off at the effective height
Select the correct sequence.
Answer: B
Correct answer: 1, 2, 3, 4
Effective height is built up in that order: the physical height is fixed by the design; momentum rise occurs first, as the jet leaves the stack; buoyancy then carries the plume further while it is still warmer than the air; and the plume levels off at the effective height once its temperature and vertical velocity have come into balance with the surroundings.
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