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The no-slip condition requires that at a solid surface the fluid

  • A.Has zero density
  • B.Has zero velocity relative to the surface
  • C.Has the same velocity as the free stream
  • D.Has zero pressure

Answer: B

The fluid in contact with the wall moves with the wall, so the relative velocity there is zero. Everything else about the boundary layer follows from reconciling that condition with the free-stream velocity a short distance away, and it is the origin of the velocity gradient that produces skin friction.

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