Quote:
Originally Posted by BillGrissom
Not really. Cavitation would be fuel vapor in low pressure regions of the flow, usually behind a moving blade or sharp corner. It is temporary and the vapor soon collapses back to liquid (violently, can even pit metal). Bubbles that stay around are surely air.
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Doesn't cavitation occur with any kind of pumps and not just blade or impeller pumps?
This is from wikipedia:
"Cavitation is the formation of vapour cavities in a liquid – i.e. small liquid-free zones ("bubbles" or "voids") – that are the consequence of forces acting upon the liquid. It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities where the pressure is relatively low. "
Diesel, hydraulic fluid etc has a small percentage of air dissolved in it. When the restriction is great enough, e.g. a completely clogged fuel strainer or a clogged tank vent, the pump will suck this dissolved air out of the fuel/ hydraulic fluid and form air bubbles.