Hydraulics and Fluid Mechanics in ME
Reynolds number is significant in

supersonics, as with projectile and jet propulsion
All of these
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls

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Hydraulics and Fluid Mechanics in ME
The flow in a pipe or channel is said to be uniform when

Each liquid particle has a definite path
The liquid particles at different sections have different velocities
The quantity of liquid flowing per second is constant
The liquid particles at all sections have the same velocities

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