Transcription of Thermodynamic Models & Physical Properties
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Thermodynamic Models & Physical Properties
23 Thermodynamic Models & Physical Properties When building a simulation, it is important to ensure that the Properties of pure components and mixtures are being estimated appropriately. In fact, selecting the proper method for estimating Properties is one of the most important steps that will affect the rest of the simulation. There for, it is important to carefully consider our choice of methods to estimate the different Properties . In Aspen Plus, the estimation methods are stored in what is called a Property Method . A property method is a collection of estimation methods to calculate several Thermodynamic (fugacity, enthalpy, entropy, Gibbs free energy, and volume) and transport (viscosity, thermal conductivity, diffusion coefficient, and surface tension).
a measure of the tendency of a component to leave its phase). Equilibrium is achieved when the fugacity of the component is equal in all phases. The fugacity of component i in liquid phase is given by: and in the vapor phase: where is the fugacity coefficient. At equilibrium . Of course, for pure components the fugacities simply reduce to i
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