What is the difference between cavitation and gas entrapment in centrifugal pumps in practice? Thank you
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What is the difference between cavitation and gas entrapment in centrifugal pumps in practice? Thank you
Air entrainment: Air enters the pump casing, causing cavitation. The pump may be installed too high or have a small inlet, resulting in insufficient material being drawn in; this leads to a pressure level in certain areas of the pump casing that is lower than the saturated vapor pressure of the material, thereby causing cavitation and severe vaporization that damages the impeller
The main difference lies in the reasons for their formation. Vapor entrapment is the entry of air into the pump, while cavitation is the vaporization of the liquid inside the pump.
The main reason is that the formation processes are different.
Firstly, the two have different manifestations: gas binding prevents liquid from being injected； Cavitation causes noise and changes in the pump’s performance parameters. Furthermore, the causes are different: gas entrapment occurs when the pump is not vented ； There are many causes of cavitation, such as high inlet resistance, increased operating temperature, and inappropriate installation height, among others.
Gas entrapment occurs when proper evacuation is not achieved or when liquid vaporizes, resulting in a reduction in flow rate. Cavitation happens when the inlet pressure is lower than the saturated vapor pressure of the liquid; this leads to vaporization accompanied by a popping sound, as well as equipment vibration and fluctuations in outlet pressure
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