Document Type : Original Research Article
Authors
Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Tehran, Iran
Abstract
Refrigerant fluids are widely used to reduce temperature in heat transfer systems and study of the thermal conductivity of these fluids is of great importance in design of heat transformers, pumps and refrigeration cycles. The main goal of this work is intended to serve as the assessment of corresponding states correlation of thermal conductivity in terms of pair interaction potential energy for R125, R134a, R12, R14 and R141b refrigerants, considering the anisotropy of potential interactions. In order to present a concise theoretical model for calculation of thermal conductivity, we first applied the extended Chapman-Enskog formalism and calculated the collision integrals and thermal conductivity values for R125, R134a, R12, R14 and R141b dilute fluids and subsequently, made a comparison between the computed results and the most accurate available experimental data. In this respect, the efficiency of intermolecular potential parameters to reproduce thermal conductivity values of R125, R134a, R12, R14 and R141b refrigerants was assessed. In the next step, the effect of non-spherical potential energy functions and the contribution of internal degrees of freedom for the thermal conductivity of the mentioned refrigerants fluids have been formulated and led to more accurate computational results. Finally, we have shown that the present theoretical model provide a good overall account of the experimental thermal conductivity of these compounds, considering the stated uncertainty in the measurements.
Graphical Abstract
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Keywords
- Thermal conductivity
- Corresponding states
- Internal degrees of freedom
- Collision integrals
- Refrigerant fluids
Main Subjects
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