Fluid Mechanics
The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.

Semi-circle
Semi-ellipse
Parabola
Hyperbola

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Fluid Mechanics
The Prandtl mixing length is

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

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