Fluid Mechanics
The Stoke's stream function applies to the

Irrotational flow only
Cases of axial symmetry
Ideal/non-viscous fluids only
None of these

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Fluid Mechanics
The Prandtl mixing length is

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

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