The velocity for subsonic flow in a pipeline_______________?
Correct answer: D. Increases in the downstream direction
- A. Is independent of the area of flow
- B. Is constant
- C. Decreases in the downstream direction
- D. Increases in the downstream direction
Explanation
For subsonic compressible flow in a pipeline, friction causes the fluid to accelerate downstream toward sonic conditions, so its velocity increases. This is opposite to the usual frictional trend for supersonic flow.
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