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The plume being drawn into the low pressure region immediately behind a stack is called stack tip _____.

  • A.backflow
  • B.recirculation
  • C.entrainment
  • D.downwash

Answer: D

Correct answer: downwash

Stack tip downwash. The wind separates round the stack and leaves a low-pressure region immediately downwind; a plume leaving too slowly is drawn into it instead of rising. Keeping the exit velocity above about 1.5 times the wind speed is what avoids it.

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