Calculation of second virial coefficients and gaseous viscosities of the refrigerants HFC-32 (CH2 F2), HFC-23 (CHF3), and HCFC-22 (CHC1F2) |
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| Authors: | M Lisal K Watanabe V Vacek |
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| Affiliation: | (1) Thermodynamics Laboratory, Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, 223 Yokohama, Japan;(2) Present address: E. Hála Laboratory of Thermodynamics, Institute of Chemical Process Fundamentals, Academy of Sciences, Rozvojovái 135, 16502 Prague 6-Suchdol, Czech Republic;(3) Department of Physics, Faculty of Mechanical Engineering, Czech Technical University Technicka 4, 16700 Prague 6-Dejvice, Czech Republic |
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| Abstract: | The second virial coefficients of refrigerants HFC-32 (CH2F2), HFC-23 (CHF3), and HCFC-22 (CHC1F2) have been correlated on the bisis of site site model potential and have been compared with experimental results. The molecular interactions consisted of repulsion dispersion and electrostatic parts. From the site site potentials adjusted to the experimental second virial coefficients, spherically averaged potentials have been determined and a subsequent calculation of gaseous viscosity has been carried out. Agreement between measured and calculated values of second virial coellicients and gaseous viscosity is satisfactory. Calculated values of second virial coefficients and gaseous viscosity beyond available experimental data, therefore. can be assumed as a reliable extrapolation to lower and higher temperatures. |
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| Keywords: | alternative refrigerants collision integrals second virial coefficient spherically averaged potential viscosite |
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