Nozzle
Steady-flow energy balance Q̇ − Ẇ = ṁ[(h₂ − h₁) + (V₂² − V₁²)/2000]. Give the inlet and exit states (two properties each) plus mass flow, and the calculator solves the remaining unknown — usually exit velocity.
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Nozzle settings
Frequently asked
- How does the nozzle calculator find exit velocity?
- From the steady-flow energy balance Q̇ − Ẇ = ṁ[(h₂ − h₁) + (V₂² − V₁²)/2000]. For an adiabatic nozzle with no work, V₂ = √(2000·(h₁ − h₂) + V₁²) with h in kJ/kg and V in m/s — the 2000 converts kJ/kg to m²/s².
- What if the energy balance gives V₂² < 0?
- The calculator reports it: no real exit velocity exists for those inputs, which means the given enthalpies/heat/work are physically inconsistent.
- Can I neglect inlet and exit velocities?
- Yes — the 'Neglect velocities' checkbox zeroes both kinetic-energy terms, the standard textbook approximation for nozzles and diffusers.