Hydraulics and Fluid Mechanics in ME
Froude number is significant in

Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
Supersonics, as with projectile and jet propulsion
All of the listed here
Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls

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Hydraulics and Fluid Mechanics in ME
Surface tension

Is a function of the curvature of the interface
Acts in the plane of the interface normal to any line in the surface
Decreases with fall in temperature
Is also known as capillarity

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