For things that are steady, with constant density… we can use Bernoulli’s equation which is…
Where each side of the Bernoulli’s equation is a constant

Main Assumptions

  1. Steady flow
  2. Incompressible flow - acceptable if the flow mach number is < 0.3
  3. Frictionless flow - solid walls introduce friction effects
  4. Flow with a single streamline - different streamlines may have different Bernoulli constants based on flow conditions
  5. No shaft work between points
  6. No heat transfer between points