Describe the phenomenon of cavitation in centrifugal pumps and explain methods to prevent it.

Cavitation in centrifugal pumps is the formation and subsequent collapse of vapor bubbles within the pump's impeller. This phenomenon occurs when the absolute pressure of the liquid falls below its vapor pressure at the operating temperature. As the liquid enters the pump impeller, the pressure drops due to the increased velocity. If the pressure drops below the vapor pressure, the liquid vaporizes, forming bubbles. These bubbles are then carried to a higher pressure region within the impeller, where they collapse violently. The implosion of these bubbles generates intense shock waves that erode the impeller material, causing damage and reducing pump performance. Cavitation is typically characteri....