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Bernoulli's equation may be applied only to flow that is

  • A.Steady, inviscid and incompressible along a streamline
  • B.Unsteady, viscous and compressible throughout the field
  • C.Turbulent and separated over the whole of the surface
  • D.At any Mach number provided the body is slender

Answer: A

The derivation assumes no viscosity, no change of density and no time dependence, and the result holds along a streamline. Applying it across a boundary layer, through a shock or at high Mach number gives answers that are simply wrong.

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