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