Water Pump Cavitation and Causes

  1. Water Pump Cavitation

When the liquid is at a certain temperature, when the pressure is reduced to the vaporization pressure at that temperature, the liquid produces vapor bubbles. This phenomenon of generating bubbles is called cavitation.

 

  1. Cavitation Collapse

The air bubbles generated during cavitation, when flowing to a high pressure, their volume decreases and bursts. This phenomenon in which the bubbles disappear in the liquid due to the increase in pressure is called cavitation collapse.

 

  1. Causes and Hazards of Cavitation

When the pump is in operation, if the partial area of the flow part (usually somewhere behind the inlet of the impeller blade) for some reason, the absolute pressure of the pumped liquid is reduced to the vaporization pressure of the liquid at the current temperature, the liquid will be there. When the liquid begins to vaporize, a large amount of steam is produced, and bubbles are formed. When the liquid containing a large amount of bubbles passes through the high-pressure zone in the impeller, the high-pressure liquid around the bubbles causes the bubbles to shrink sharply and even burst. While the bubbles are condensed and burst, the liquid particles fill the cavities at a very high speed. At this moment, a very strong water hammer is produced, and the impact stress on the metal surface can be hit with a high impact frequency of several hundred to several thousand. Under atmospheric pressure, the impact frequency can reach tens of thousands of times per second, and the pump chamber will be broken down in severe cases.

 

  1. Cavitation Process

The process of generating bubbles and bubble bursting in the water pump to damage the flow-through components is the cavitation process in the water pump. After cavitation occurs, the pump will not only cause damage to the flow parts, but also produce noise and vibration, and cause the performance of the pump to decline. In severe cases, the liquid in the pump will be interrupted and the pump will not work properly.

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