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The Reynolds number expresses the ratio of

  • A.Inertial forces to elastic forces
  • B.Inertial forces to viscous forces
  • C.Pressure forces to inertial forces
  • D.Viscous forces to gravitational forces

Answer: B

It compares the inertia of the fluid with its viscosity, so a high value means viscous effects are confined to thin layers and a low value means they pervade the flow. Matching it between model and full scale is the central difficulty of wind-tunnel testing.

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