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A water tunnel is sometimes used instead of a wind tunnel because

  • A.Water is compressible and air is not
  • B.It reaches higher Mach numbers
  • C.It needs no model
  • D.Lower speeds make vortex flows easier to see

Answer: D

The same Reynolds number is reached at a far lower speed in water, so vortex formation and breakdown unfold slowly enough to be filmed and understood. Dye injection gives exceptionally clear visualisation, which is why water tunnels are favoured for studying delta-wing vortices.

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