I am setting up an experimental station for which I am using a small gear pump to pump water. I have noticed that on the discharge port of the pump, a short row of bubbles comes out at high flows and low pressures.
For example, at 650 ml/min and 2 bar of system pressure I might observe a relatively long row of bubbles coming out from the port. By increasing the system pressure up to 7 bar, the row shortens and eventually disappears. The same happens if I decrease the flow. I have checked the feed, and it does not contain any bubbles.
This has led me to believe I am having some degree of cavitation in my pump, is this correct?