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Special topic J-T valve

  • An adiabatic process is one in which no heat is exchanged with surrounding.
  • A special case is adiabatic flow through a valve.
  • This is when the valve is insulated or flow is so rapid that any heat transfer is negligible.

  • Take the valve as our system, then the system is system in a steady state since valve itself does not change.

    The First law for the system is

    Enthalpy is a function of T, P → Differential is

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Thermodynamics in Energy Engineering

Hanyang University