Fluid Mechanics
Power number is the ratio of

Inertial stress to gravitational stress
Inertial stress to drag stress
Drag stress to inertial stress
Gravitational stress to drag stress

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Fluid Mechanics
The Prandtl mixing length is

Independent of radial distance from the pipe axis
Useful for computing laminar flow problems
Zero at the pipe wall and is a universal constant
Independent of the shear stress

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