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Flashing is the first stage of cavitation. Flashing occurs in liquid flows when some of the liquid changes permanently into vapour. This is brought on by a reduction in pressure forcing the liquid to change to gaseous state. Bubbles can suddenly collapse or implode as the pressure increases down line, producing Cavitation.
Cavitation:
This phenomenon will occur when the vapor pressure goes below the outlet pressure (P2) and recovers above the outlet pressure after some time.
Flashing:
This phenomenon will occur only when the vapor pressure goes below outlet pressure and will not recover above the outlet pressure.
