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Which statement about the shape factor is FALSE?

  • A.It falls as the boundary layer approaches separation
  • B.It is larger for a laminar layer than for a turbulent one at the same conditions
  • C.It is the ratio of displacement to momentum thickness
  • D.It is used as a separation indicator in boundary-layer codes

Answer: A

The shape factor rises towards separation, not falls, because the profile becomes less full as near-wall momentum is drained away. The other three statements are correct, and the Blasius value of 2.59 against a turbulent figure near 1.4 illustrates the second.

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