THE CALCULATION OF HIGH-PRESSURE VISCOSITY FOR REFRIGERANT MIXTURES
Abstract
This paper features a mathematical model for computing the viscosity in the fluid domain for a hydrofluorocarbon mixture with the help of statistical thermodynamics. The viscosity pf HFC-134a (1,1,1,2-Tetrafluoroethane) and HFC-125 (Pentafluoroethane) mixtures was calculated as an example of hydrofluorocarbon mixtures. To calculate the thermodynamic properties of a real fluid, the models were applied based on the Lennard-Jones intermolecular potential. The analytical results obtained via statistical thermodynamics are compared with the experimental data and show relatively good agreement.
Downloads
References
J. Millat, J.H. Dymond: C.A. Nieto de Castro, Transport Properties of Fluids, Cambridge, University Press, 1996
J.H. Ferziger, H.G. Kaper: Mathematical Theory of Transport Processes in Gasses, North‐ Holland Publishing Company, London, 1972
F.R.W.McCourt, J.J. Beenakker, W.E. Köhler, I. Kuscer: Nonequilibrium Phenomena in Polyatomic gases, Clarendon Press, London, 1990
S. Chapman, T.G. Cowling: The Mathematical Theory of Non‐Uniform Gases, Third Edition, Cambridge, University Press, 1970
P.D. Neufeld, A.R. Janzen, R.A. Aziz: Empirical Equations to Calculate 16 of the Transport Collision Integrals for the Lennard‐Jones (12‐6) Potential, The Journal of Chemical Physics, Vol.57, No.2, pp. 1100‐1102
T.‐H. Chung, L.L. Lee, K.E. Starling: Applications of Kinetic Gas Theories and Multiparameter Correlation for Prediction of Dillute Gas Viscosity and Thermal Conductivity, Ind. Eng. Chem. Res., Vol. 27, No. 4, pp. 671‐659, 1988
N. Shibasaki‐Kitajawa, M. Takahashi, C. Yokoyama: Viscosity of Gaseous HFC‐134a Under High Pressures, International Journal of Thermophysics, Vol.19, No. 5, pp.:1285‐1295, 1998
M. Takahashi, N. Shibasaki‐Kitajawa, C. Yokoyama: Viscosity of Gaseous HFC‐125 Under High Pressures, International Journal of Thermophysics, Vol.20, No. 2, pp.:445‐453, 1999
C. Yokoyama, T. Nishino, M. Takahsashi: Viscosity of Gaseous Mixtures of HFC‐125+HFC‐134a under Pressure, Fluid Phase Equilibria, Vol. 174, pp. 231‐240, 2000