Cavitation - Pumps and Propellers

Pumps and Propellers

Major places where cavitation occurs are in pumps, on propellers, or at restrictions in a flowing liquid.

As an impeller's (in a pump) or propeller's (as in the case of a ship or submarine) blades move through a fluid, low-pressure areas are formed as the fluid accelerates around and moves past the blades. The faster the blades move, the lower the pressure around it can become. As it reaches vapour pressure, the fluid vaporizes and forms small bubbles of gas. This is cavitation. When the bubbles collapse later, they typically cause very strong local shock waves in the fluid, which may be audible and may even damage the blades.

Cavitation in pumps may occur in two different forms:

Read more about this topic:  Cavitation

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Pumps and Propellers - Discharge Cavitation
... Discharge cavitation occurs when the pump discharge pressure is extremely high, normally occurring in a pump that is running at less than 10% of its ... causes the majority of the fluid to circulate inside the pump instead of being allowed to flow out the discharge ... flows around the impeller, it must pass through the small clearance between the impeller and the pump housing at extremely high velocity ...

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