While I am studying about Mass and Energy analysis in Control volumes in Cengel and Boles I came a across a term called flow energy. The textbook definition that was given is as follows - "The amount of energy or work that needs to be done to the fluid in order to maintain the flow in a CV (Control Volume)". I am not able to differentiate between kinetic energy of the flowing fluid and the flow energy of the flowing fluid. I tried searching for answers in various textbooks but none of them has clearly mentioned the difference instead what I found frequently was the definition of flow energy alone.
Pressure energy, P*V, is a useful term to use when trying to determine the amount of energy in a vessel that is stagnant with no K.E. if the such a vessel where to have some flow due to some orifices perse then you can say that the fluid also has K.E. I have that helps.