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A laminar layer separates when its shape factor reaches roughly

  • A.1.40
  • B.1.00
  • C.3.5
  • D.2.59

Answer: C

The Blasius value of 2.59 applies with no pressure gradient; as an adverse gradient drains the near-wall momentum the factor climbs, and separation follows around 3.5. A turbulent layer holds on until about 2.4, a lower figure because its profile is inherently fuller.

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