Hydraulics and Fluid Mechanics in ME
Slip of a reciprocating pump is negative, when

Suction pipe is short and delivery pipe is long and the pump is running at low speeds
Delivery pipe is long and pump is running at high speeds
Suction pipe is long and delivery pipe is short and the pump is running at high speeds
Suction pipe is short and pump is running at low speeds

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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
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

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