Hydraulics and Fluid Mechanics in ME
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

μ π³ N² R⁴ /3600 t
μ π³ N² R⁴ /1800 t
μ π³ N² R² /1800 t
μ π³ N² R² /3600 t

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Hydraulics and Fluid Mechanics in ME
Reynolds number is significant in

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
supersonics, as with projectile and jet propulsion
All of these
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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