New formulations of the corresponding states principle for the transport properties of pure dense fluids

Abstract

The usual formulations of the corresponding states principle are restricted to groups of similar substances. This can be understood from their common theoretical basis which is a very idealized molecular gas model. In this paper, a new approach to develop formulations of the corresponding states principle without this limitation is presented for the transport properties of pure dense fluids, viscosity and thermal conductivity. The theory is based on the concept of a point of correspondence, that is a universally distinguished point on the transport property surface at which a universal behavior of the transport properties is shown to exist for all fluids. On this basis, the reduced transport property at the temperature of the point of correspondence becomes a universal function of reduced pressure. This theoretical result is verified for several fluids which could not be forced into a common correlation by all earlier efforts. The universal result for one isotherm is generalized using the residual concept for transport properties.