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A turbulent boundary layer grows along a flat plate roughly in proportion to

  • A.Distance itself
  • B.The four-fifths power of distance
  • C.The square root of distance
  • D.The cube of distance

Answer: B

The turbulent layer thickens far more quickly than the laminar half-power law, going roughly as distance to the four-fifths. The practical consequence is that a long surface with early transition carries a much thicker layer at its trailing edge than the laminar estimate would suggest.

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