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.

Transition
Prandtl mixing
Equivalent
None of these

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Is zero at the wall and increases linearly to the centre
Is zero at the centre and varies linearly with the radius
Varies parabolically across the cross-section
Remains constant over the cross-section

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