Practice Stacktip Downwash (1.8) - Gaussian Dispersion Model - Example, Additional topics

Practice: Stacktip Downwash

Lesson 1.8Gaussian Dispersion Model - Example, Additional topics

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10 questions

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4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is stacktip downwash?
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Think about how wind interacts with stacks.
Question 2.
Why should the gas velocity be at least 1.5 times the wind speed?
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Consider the relationship between gas and wind speeds.
3Question 3.
What happens during stacktip downwash?
- Gases disperse into the atmosphere
- Gases recirculate back to the surface
- Gases are contained within the stack
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Remember the interaction of wind and stack emissions.
4Question 4.
Stack gas velocity should be higher than wind speed to reduce downwash. True or False?
- True
- False
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Consider the relationship between gas and wind speeds.
Question 5.
A new factory is proposed to be built in an urban area. The stack’s gas velocity is expected to be 10 m/s, and the average wind speed is 5 m/s. Evaluate whether this design prevents stacktip downwash, and recommend changes if needed.
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Evaluate the relationship between the gas velocity and wind speed.
Question 6.
Discuss how a tall building positioned near a factory stack might impact local air quality. What strategies should be employed to mitigate potential negative effects?
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Consider the phenomenon of building downwash.

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