Hydraulics and Fluid Mechanics in ME
Mach number is significant in

supersonics, as with projectiles and jet propulsion
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 force, and wave making effects, as with ship’s hulls
all of fhe above

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Hydraulics and Fluid Mechanics in ME
The Euler's equation for the motion of liquids is based upon the assumption that

The fluid is non - viscous, homogeneous and incompressible
The flow is continuous, steady and along the stream line
The velocity of flow is uniform over the section
All of these

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