Saturation Vapor Curve
The saturation vapor curve usually states for the separation curve between the two-phase state and the vapor state in the T-s diagram. When used in a power cycle
Thermodynamic cycle
A thermodynamic cycle consists of a series of thermodynamic processes transferring heat and work, while varying pressure, temperature, and other state variables, eventually returning a system to its initial state...

, the fluid expansion depends strongly on the nature of this saturation curve :
  • A "wet" fluid shows a negative saturation vapor curve. If overheating before the expansion is limited, a two-phase state is obtained at the end of the expansion.

  • An "isentropic" fluid shows a vertical saturation vapor curve. It remains very close to the saturated vapor state after an hypothetical isentropic expansion.

  • A "dry" fluid shows a positive saturation vapor curve. It is in dry vapor state at the end of the expansion, and strongly overheated.

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.