- Air entrainment is the introduction of air bubbles into the pump impeller during operation.
- It differs from cavitation in that the bubbles are air rather than water vapor.
- It also differs in that the air bubbles do not collapse in the impeller releasing energy like cavitation bubbles do.
- Air can be either large coarse bubbles or fine bubbles
- Both results in a two-phased pumped medium and can damage the pump, but coarse bubbles are more severe.
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