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The starting vortex shed when an airfoil begins to move is explained by

  • A.The continuity equation applied to the wake region
  • B.The perfect gas law applied at the trailing edge
  • C.Kelvin's theorem, which requires total circulation to stay zero
  • D.Bernoulli's equation applied along the trailing streamline

Answer: C

Kelvin's circulation theorem states that the circulation around a material contour enclosing the whole field cannot change, so the bound circulation that produces lift must be matched by an equal and opposite vortex left behind in the fluid.

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