To process this page used the WaterSteamPro function "wspXSTW": vapor fraction [-] as function of temperature t [K], speed of sound w [m/sec].
From version 5.6 this function calculates value of sound velocity in double-phase region from isoentropic exponent that is conform to thermodynamic. Until version 5.6 this function used formula: X = (W - Ww)/(Ws - Ww), where Ww = wspWSWT, Ws = wspWSST which was not right. Now it is calculated correctly. The range of validity is double-phase (water-vapor) area.
WaterSteamPro is a registered trademark of Moscow Power Engineering Institute (Technical University).
Copyright (c) MPEI (TU), 1999-2010.
Copyright (c) Konstantin A. Orlov, 1999-2010.