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Which of the following is NOT a consequence of a boundary layer going turbulent?

  • A.The layer becomes more resistant to separation
  • B.The layer thickens more rapidly along the surface
  • C.The velocity profile becomes fuller
  • D.The skin-friction drag falls

Answer: D

Skin friction rises, not falls, because the fuller profile gives a steeper gradient at the wall. The other three are all genuine consequences, and the first two together are why the choice between laminar and turbulent is never obvious.

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