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The momentum thickness of a boundary layer is directly related to

  • A.The displacement of the outer streamlines
  • B.The height of the layer itself
  • C.The pressure gradient at the wall
  • D.The friction drag accumulated so far

Answer: D

Von Karman's momentum integral ties the growth of momentum thickness directly to the wall shear stress, so the momentum thickness at the trailing edge is a direct measure of the friction drag the surface has generated. It is the single most useful of the three thicknesses.

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