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Boundary-layer suction delays separation by

  • A.Removing the slowest fluid at the wall
  • B.Adding mass to the boundary layer
  • C.Cooling the surface
  • D.Increasing the surface roughness

Answer: A

Drawing off the slowest fluid through a porous or slotted surface leaves a fuller profile that can withstand a greater pressure rise. It is highly effective and is used for laminar flow control as well, but it demands ducting, pumping power and a surface that will not clog.

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