Correlation and prediction of the transport properties of refrigerants using two modified rough hard-sphere models

• Published in: International journal of thermophysics Vol. 20; no. 1; pp. 149 - 161
• Main Authors: TEJA, A. S, SMITH, R. L, KING, R. K, SUN, T. F
• Format: Conference Proceeding Journal Article
• Language: English
• Published: New York, NY Springer 1999
• Subjects: Applied sciences; Correlation methods; Density (specific gravity); Energy; Energy. Thermal use of fuels; Exact sciences and technology; Forecasting; Mathematical models; Mixtures; Pressure; Refrigerants; Refrigerating engineering; Refrigerating engineering. Cryogenics. Food conservation; Temperature; Thermal conductivity of gases; Viscosity of gases; Roughness; R 12 fluid; R 22 fluid; Hard sphere model; Experimental study; Density; Physical properties; Transport process; Binary mixture; R 11 fluid; Thermal conductivity; Lennard Jones model; Refrigerant fluid
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1023/A:1021438516081

Two methods are presented for the correlation and prediction of the viscosities and thermal conductivities of refrigerants R11, R12, R22, R32, R124, R125, R134a, R141b, and R152 and their mixtures. The first (termed RHS1) is a modified rough-hard-sphere method based on the smooth hard-sphere correlations of Assael et al. The method requires two or three parameters for characterizing each refrigerant but is able to correlate transport properties over wide ranges of pressure and temperature. The second method (RHS2) is also a modified rough-hard-sphere method, but based on an effective hard-sphere diameter for Lennard-Jones (LJ) fluids. The LJ parameters and the effective hard-sphere diameter required in this method are determined from a knowledge of the density-temperature behavior of the fluid at saturation. Comparisons with the rough-hard-sphere method of Assael and co-workers (RHS3) are shown. We also show that the RHS2 method can be used to correlate as well as predict the transport properties of refrigerants.