Hydraulics and Fluid Mechanics in ME
Froude number is significant in

Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
All of the listed here
Supersonics, as with projectile and jet propulsion
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 also known as capillarity
Is a function of the curvature of the interface
Decreases with fall in temperature
Acts in the plane of the interface normal to any line in the surface

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