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The laminar sublayer in a turbulent boundary layer is

  • A.The whole layer at low Reynolds number
  • B.The wake behind the body
  • C.A thin region where viscous stress dominates
  • D.The outer part of the layer

Answer: C

Immediately at the wall the turbulent fluctuations are suppressed and momentum is carried by molecular viscosity alone. Whether a surface behaves as hydraulically smooth depends on whether its roughness elements are buried inside this sublayer or protrude through it.

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