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
pressure is increased
flow is increased

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Hydraulics and Fluid Mechanics in ME
In an outward flow reaction turbine

The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
The water enters the wheel at the outer periphery and then flows towards the centre of the wheel
The flow of water is partly radial and partly axial
The water flows parallel to the axis of the wheel

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