Fluid Mechanics
Potential flow is the flow of

Compressible fluids with shear
Compressible fluids with no shear
Incompressible fluids with no shear
Incompressible fluids with shear

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Fluid Mechanics
The Prandtl mixing length is

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

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