Pumps cause fluid flows in liquids.  Pumping a liquid is more efficient than compressing a gas, because one can pump a great deal more liquid per unit volume, and liquids, being basically incompressible, do not gain an appreciable amount of heat during the pumping process.  Pumps cannot handle gasses or saturated vapors, because such fluids tend to cavitate, or boil.  Cavitation causes excessive shocks within the pump and can rapidly lead to pump failure.

Possible modeling assumptions for pumps include: isothermal.


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