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For a converging duct carrying a subsonic flow, a reduction in area produces

  • A.An increase in velocity and a fall in pressure
  • B.A decrease in velocity and a rise in pressure
  • C.No change in velocity
  • D.An increase in both velocity and pressure

Answer: A

In subsonic flow the density changes more slowly than the velocity, so continuity behaves much as it does in incompressible flow: squeezing the duct speeds the flow up and drops the pressure. The behaviour reverses once the flow is supersonic, which is the content of the area-velocity relation.

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