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Separation is provoked by

  • A.Any pressure gradient at all
  • B.An adverse pressure gradient
  • C.A favourable pressure gradient
  • D.A zero pressure gradient

Answer: B

Fluid near the wall has little momentum, so a pressure rising downstream can bring it to rest and then reverse it. A favourable gradient accelerates the flow and keeps the layer firmly attached, which is why the forward part of a well-designed body rarely separates.

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