MaterialPropertyLib::IAPWSIF97Region4 Namespace Reference

Functions
double	waterSaturationTemperature (double const pressure)

Function Documentation

waterSaturationTemperature()

double MaterialPropertyLib::IAPWSIF97Region4::waterSaturationTemperature ( double const pressure )

inline

The saturation-temperature equation function in region 4, from "The International Association for the Properties of Water and Steam" (see http://www.iapws.org/relguide/IF97-Rev.pdf) p.35, section 8.2.

Definition at line 23 of file WaterSaturationCurveIAPWSIF97Region4.h.

{
    static constexpr std::array n = {0.11670521452767e4,  -0.72421316703206e6,
                                     -0.17073846940092e2, 0.12020824702470e5,
                                     -0.32325550322333e7, 0.14915108613530e2,
                                     -0.48232657361591e4, 0.40511340542057e6,
                                     -0.23855557567849,   0.65017534844798e3};
 
    static constexpr double p_c = 1e6;
 
    double const beta2 = std::sqrt(pressure / p_c);
    double const beta = std::sqrt(beta2);
 
    double const E = beta2 + n[2] * beta + n[5];
    double const F = n[0] * beta2 + n[3] * beta + n[6];
    double const G = n[1] * beta2 + n[4] * beta + n[7];
 
    double const D = 2 * G / (-F - std::sqrt(F * F - 4 * E * G));
 
    double const n10pD = n[9] + D;
 
    return (n10pD - std::sqrt(n10pD * n10pD - 4 * (n[8] + n[9] * D))) / 2;
}

References MaterialPropertyLib::beta.

Referenced by MaterialPropertyLib::WaterLiquidDensityIAPWSIF97Region4::value(), MaterialPropertyLib::WaterLiquidEnthalpyIAPWSIF97Region4::value(), MaterialPropertyLib::WaterSaturationTemperatureIAPWSIF97Region4::value(), MaterialPropertyLib::WaterVapourDensityIAPWSIF97Region4::value(), and MaterialPropertyLib::WaterVapourEnthalpyIAPWSIF97Region4::value().