Hydraulics and Fluid Mechanics in ME
Two dimensional flows 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 particles, at any point, is the same at successive periods of time
The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

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Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Area of jet at vena contracta to the area of orifice
None of these
Actual velocity of jet at vena contracta to the theoretical velocity
Actual discharge through an orifice to the theoretical discharge

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