Hydraulics & Fluid Mechanics
Fluid is a substance that

always expands until it fills any container
has the same shear stress.at a point regardless of its motion
cannot remain at rest under action of any shear force
cannot be subjected to shear forces

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Hydraulics & Fluid Mechanics
The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

constant over the cross section
zero at the mid plane and varies linearly with distance from mid plane
parabolic distribution across the section
zero at plates and increases linearly to midpoint

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Hydraulics & Fluid Mechanics
Steady flow occurs when

the direction and magnitude of the velocity at all points are identical
the magnitude and direction of the velocity do not change from point to point in the fluid
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

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