Hydraulics and Fluid Mechanics in ME
Reynolds 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 these
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls

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Hydraulics and Fluid Mechanics in ME
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

Q = Cd × bH2 × √(2gh)
Q = Cd × bH × √(2gh)
Q = Cd × bH₁ × √(2gh)
Q = Cd × b (H2 - H1) × √(2gh)

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