Correlation of Viscosity, Thermal Conductivity and Prandtl Number for Water and Steam as a Function of Temperature and Pressure

Abstract

In this report equations of viscosity, thermal conductivity and Prandtl number for water and steam were correlated as a function of temperature and pressure, while most of equation is previous investigations had been expressed as a function of temperature and density. Directly from values of temperature and pressure without knowing the value of density, property values can be calculated using equations in this report. Whole regions of up to 1000°C, 3500 bar for viscosity, up to 700°C, 500 bar for thermal conductivity and up to 600°C, 500 bar for Prandtl number are covered by three equations each, namely equations for the water, the steam and the critical regions. In the water and the steam regions those for the water, the steam and the critical regions. In the water and the steam regions those properties are expressed as the polynomials of pressure in two or three terms, while the narrow region near the critical point is expressed in a slightly more complicated form. Values calculated by the correlated equations were compared with the recent experimental values.