This formulation is recommended for the calculation of the thermal conductivity of heavy water in its fluid phases.
The formulation consists of a dilute-gas term that is only a function of temperature, a finite-density term as a function of temperature and density, and a critical enhancement term as a function of temperature and density. A simplified version of the critical enhancement term is supplied for simplified industrial use.
The region of validity the entire stable fluid region from the melting curve to 825 K at pressures up to 250 MPa. It extrapolates in a physically reasonable way outside this region.
The development of the formulation and comparisons to available data are described in detail in a scientific article.
This Release is the product of the Working Group "Thermophysical Properties of Water and Steam" (TPWS) of the International Association for the Properties of Water and Steam (IAPWS).