# Physical Property Estimation Methods

FluidFlow can use any of the following thermophysical properties during flow calculations. Density, Specific Heat, Thermal Conductivity, Viscosity, Heat of Vaporization, Enthalpy, Melting Point, Vapor Pressure and Surface Tension. The physical properties are often complex functions of pressure, temperature and phase state. Data needed to evaluate these properties at phase states, pressures and temperatures in the physical world are stored in a physical property database that contains over 1200 fluids. The user can select any one of the following estimation methods: For Liquid Density Prediction: ▪A single fixed Value ▪Yamada Gunn method with a reference density ▪Spencer Danner method ▪Yamada Gunn method without a reference density ▪Interpolation from a table of values ▪Peng Robinson Equation of State ▪Benedict Webb Rubin Equation of State ▪Lee Kesler law of Corresponding States For Liquid Specific Heat Capacity Prediction: ▪A single fixed Value ▪A polynomial approximation ▪Bondi estimation method ▪Lee Kesler ▪Interpolation from a table of values For Liquid Specific Heat Capacity Prediction: ▪A single fixed Value ▪A polynomial approximation ▪Latini estimation method ▪Sato Riedel estimation method ▪A log power law approximation method ▪Interpolation from a table of values For Liquid Viscosity Prediction: ▪A single fixed Value ▪A log polynomial approximation ▪A natural log series ▪Interpolation from a table of values ▪Andrade method ▪Przezdziecki estimation method For Vapor Pressure Prediction: ▪A log polynomial approximation ▪Interpolation from a table of values ▪Wagner estimation ▪Antoine estimation For Gas Density Prediction: ▪Peng Robinson Equation of State ▪Benedict Webb Rubin Equation of State ▪Lee Kesler law of Corresponding States ▪a polynomial based on ideal gas constants ▪Lee Kesler law of Corresponding States For Gas Thermal Conductivity Prediction: ▪A polynomial approximation ▪Chung estimation method ▪Interpolation from a table of values For Gas Viscosity Prediction: ▪A polynomial approximation ▪Chung estimation method ▪Interpolation from a table of values ▪Lucas corresponding states estimation For Heat of Vaporisation Prediction: ▪A single fixed Value which is adjusted by the software as a function of temperature ▪An estimation method based on critical properties For Liquid Surface Tension Prediction: ▪A linear approximation ▪An estimation method based on critical properties