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Reynolds number is the ratio of

  • A.Lift force to drag force
  • B.Inertial forces to viscous forces
  • C.Flow speed to the speed of sound
  • D.Pressure forces to gravitational forces

Answer: B

Reynolds number determines whether a flow is dominated by inertia or by viscosity, and therefore whether the boundary layer is laminar or turbulent and how thick it is. Two flows with the same Reynolds number over geometrically similar bodies behave alike.

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