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Transition from a laminar to a turbulent boundary layer on a smooth flat plate typically occurs near a Reynolds number of

  • A.Five thousand
  • B.Fifty million
  • C.Five hundred
  • D.Five hundred thousand

Answer: D

The commonly quoted figure is around five times ten to the fifth based on distance from the leading edge, though the real value depends heavily on surface roughness, free-stream turbulence, pressure gradient and noise. It should be treated as an order of magnitude rather than a constant.

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