Vle have developed a predictive corresponding states model for the thermo· physical properties of pure refrigerants and refrigerant mixtures. The bulk phase properties such as the density, enthalpy and entropy are predicted using the prin· ciple of extended corresponding states. This theoretically based model uses shape factors to insure conformality among the various components and R134a is us...

Models based on the corresponding-states principle have been extensively used for several equilibrium and transport properties of different pure and mixed fluids. Some limitations, however, have been encountered with regard to its application to long chain or polar molecules. Following previous studies, where it was shown that the corresponding-states principle could be used to predict thermoph...

The Corresponding States (CS) density models for mixture proposed here, one for saturated and one for compressed liquid, are analytically similar to the pure fluid liquid density exposed in the former paper, but now with critical constants and 8,, replacing wm , as from the mixing rules. The mixing rules present two adjustable interaction coefficients for each binary pair, but they are set to u...

The principle of corresponding states is used to evaluate the effects of the thermodynamic characteristics of the working fluid on the performance of refrigeration cycles. The desired characteristics, expressed in terms of the critical temperature and ideal gas heat capacity cc;) using propane as the reference fluid, are examined for various departures from the theoretical (ideal) vapor compres...

The liquid-vapor interfacial tension of various simple, polar, and ionic fluids is studied in a corresponding-states analysis originally suggested by Guggenheim [1]. The results for real fluids are compared to the corresponding ones for model fluids of each of the three types. For simple and weakly polar fluids, the data is mapped onto a master curve, as already demonstrated by Guggenheim. For ...

In this paper the explicit form of the operator of transformation of the vacuum states for the general two-mode Bogolubov transformation is found † On leave of absence from VNIIFTRI, Mendeleevo, Moscow Region 141570, Russia 1

We develop a general theory on absence of quantum states corresponding to unstable classical channels. A principal example treated in detail is the following: Consider a real-valued potential on , , which is smooth outside zero and homogeneous of degree zero. Suppose that the restriction of to the unit sphere is a Morse function. We prove that there are no –solutions to the Schrödinger equation...

We have formulated a general approach for transforming an analytical equation of state ~EOS! into the crossover form and developed a generalized cubic ~GC! EOS for pure fluids, which incorporates nonanalytic scaling laws in the critical region and in the limit r→0 is transformed into the ideal gas equation EOS. Using the GC EOS as a reference equation, we have developed a generalized version of...

The quantum theorem of corresponding states is applied to N=13 and N=26 cold quantum fluid clusters to establish where para-hydrogen clusters lie in relation to more and less quantum delocalized systems. Path integral Monte Carlo calculations of the energies, densities, radial and pair distributions, and superfluid fractions are reported at T=0.5 K for a Lennard-Jones (LJ) (12,6) potential usin...