Method neff

src/AbstractState.cpp:728–735

    return smolar_idealgas() / molar_mass();
}
double AbstractState::neff() {
    const double tau = calc_T_reducing() / _T;
    const double delta = _rhomolar / calc_rhomolar_reducing();
    const double Ar01 = delta * dalphar_dDelta();
    const double Ar11 = tau * delta * d2alphar_dDelta_dTau();
    const double Ar20 = tau * tau * d2alphar_dTau2();
    return -3.0 * (Ar01 - Ar11) / Ar20;
}
double AbstractState::smolar_excess() {
    if (!_smolar_excess) calc_excess_properties();
    return _smolar_excess;