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A slip line downstream of a shock intersection is a surface across which

  • A.Nothing differs at all
  • B.The flow direction differs by ninety degrees
  • C.Velocity and entropy differ but pressure and flow direction match
  • D.Pressure differs but velocity matches

Answer: C

Mechanical equilibrium requires the pressure and the flow direction to be continuous across the surface, but there is no requirement for the speed, temperature or entropy to match, and they generally do not. The result is a vortex sheet trailing downstream from the intersection point.

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