Thermophysical Properties of Fluids

Thermodynamic models are widely used for the calculation of equilibrium and thermophysical properties of fluid mixtures. Two types of such models will be examined cubic equations of state and activity coefficient models. In this chapter cubic equations of state models are used. Volumetric equations of state (EoS) are employed for the calculation of fluid phase equilibrium and thermophysical properties required in the design of processes involving non-ideal fluid mixtures in the oil and gas and chemical industries. It is well known that the introduction of empirical parameters in equation of state mixing rules enhances the ability of a given EoS as a tool for process design although the number of interaction parameters should be as small as possible. In general, the phase equilibrium calculations with an EoS are very sensitive to the values of the binary interaction parameters. 

Assael, M. J., J. P. M. Trusler, and T. R Tsolakis. 1996. Thermophysical Properties of Fluids. London Imperial College Press. 

Thermophysical Properties of Fluid Systems, National Institute of Standards and Technology http //webbook.nist.gov/ chemistry/fluid/ (accessed February 7, 2006). 

Professor Wakeham is interested in the relationship between the bulk thermophysical properties of fluids and the intermolecular forces between the molecules that comprise them. Thus, at one extreme, he is involved in the determination of intermolecular forces from measurements of macroscopic properties and the development and application of the statistical mechanics and kinetic theory that interrelate them. He is also actively involved in the measurement of the thermophysical properties of fluids under a very wide variety of thermodynamic states. The same thermophysical properties find application in the process industries within the design of a plant. A part of Professor Wakeham s activities are therefore concerned with the representation and extension of a body of accurate information on thermophysical properties in a fashion that allows their use with software packages for process simulation. 

G. Birnbaum. Study of Atomic and Molecular Interactions from Collision-Induced Spectra. In J. V. Sengers (ed.), Thermophysical Properties of Fluids, American Society of Mechanical Engineers, New York, 1981, pp. 8-17. 

Yoimglove, B. A Ely, J. F. Thermophysical properties of fluids. 11. Methane, ethane, propane, isobutane, and normal butane. J. Phys. Chem. Ref. Data 1987, 16, 577—798. 

N. B. Vargaftik, Handbook on the Thermophysical Properties of Fluids Nauka, Moscow, 1972 (in Russian). 

From E. W. Lemmon, M. O. McLinden, and D. G. Friend, Thermophysical Properties of Fluid Systems in NIST Chemistry WebBook, NIST Standard Reference Database Number 69, Eds. P. J. Linstrom and W. G. Mallard, June 2005, National Institute of Standards and Technology, Gaithersburg, Md. (http //web-book.nist.gov) and Wagner, W, and A., Pruss, The lAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use, /. Phys. Chem. Ref. Data 31(2) 387-535, 2002. 

Lemmon, E.W, McLinden, M.O., and Friend, D.G., Thermophysical Properties of Fluid Systems, NIST Chemistry WebBook, NIST Standard Reference Database Number 69, Linstrom, P.J. and Mallard, W.G., Eds., National Institute of Standards and Technology, Gaithersburg, Maryland. 

---