Fluid Mechanics
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.

Equivalent
Prandtl mixing
None of these
Transition

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Fluid Mechanics
The Prandtl mixing length is

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

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