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Particle image velocimetry measures a flow by

  • A.Timing the tunnel's start-up transient
  • B.Tracking seeded particles between laser pulses
  • C.Sensing the pressure at wall taps
  • D.Measuring the model's surface temperature

Answer: B

Illuminating a seeded plane twice in quick succession and cross-correlating the two images gives the velocity field across the whole plane at once. It is non-intrusive and rich, though seeding a large tunnel uniformly and safely is a substantial practical problem.

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