Hydraulics and Fluid Mechanics in ME
Froude number is significant in

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

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Hydraulics and Fluid Mechanics in ME
Discharge of a centrifugal pump is

Directly proportional to (diameter)² of its impeller
Inversely proportional to (diameter)² of its impeller
Inversely proportional to diameter of its impeller
Directly proportional to diameter of its impeller

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