Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

pressure becomes more than critical pressure
the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
flow is increased
pressure is increased

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Hydraulics and Fluid Mechanics in ME
Coefficient of contraction is the ratio of

Loss of head in the orifice to the head of water available at the exit of the orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice
Loss of head in the orifice to the head of water available at the exit of the orifice

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