The State Dependency of the Effective Pair Potential Parameters

• Autorzy: Keshavarzi E. , Hashemi F. , Ghazvini Z.
• Języki publikacji: EN

Abstrakty

EN

The state dependency of the effective pair potential parameters [epsilon eff (T,ro ), sigma eff (T)] has been studied for gas, liquid and supercritical regions for different types of fluids.We have assumed that the configuration of potential energy between Nmolecules can be divided into independent pair clusters with an effective pair potential, in which the parameters of the potential are state dependent.We have obtained the values of epsilon eff (T, ro),and sigma eff (T) using p-V-T data. The results show, that epsilon eff (T, ro) increases with density for those thermodynamic states, at which pair interactions are dominant, while it decreases with density for those systems, where triplet and higher clusters are dominant. Both epsilon eff (T, ro) and sigma eff (T) decrease with temperature, which coincides with the literature data. Aremarkable result of the present work is the determination of density, at which triplet clusters come into account. We have also shown new corresponding states for the effective well depth parameter, which is held for all examined fluids, including Ar, Xe, CH4, N2, CO, H2O, CO2, CH3OH, C2H6 and C6H6 for different isotherms. Alinear dependence of epsilon eff (T, ro) versus density and temperature on the zeno-line is predicted.

Słowa kluczowe

EN

corresponding states; effective pair potential; equation of state; second virial coefficient; zeno-line

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2004
• Tom: Vol. 78 / nr 10
• Strony: 1893--1906
• Opis fizyczny: Bibliogr. 27 poz., rys.

Twórcy

autor

Keshavarzi E.

• Dept. of Chemistry, Isfahan University of Technology, Isfahan, 84154, Iran

autor

Hashemi F.

• Dept. of Chemistry, Faculty of Sciences, Azzahra University, Tehran, Iran

autor

Ghazvini Z.

• Dept. of Chemistry, Faculty of Basic Sciences, Mazandaran University, Babolsar, Iran

Bibliografia

• 1. Maitland G.C., Rigby M., Smith E.B. and Wakeham W.A., Intermolecular Forces. Their Origin and Determination, Clarendo Press, Oxford, 1981.
• 2. Clarke A.G. and Smith E.B., J. Chem. Phys., 48, 3988 (1968); Dawe R.A. and Smith E.B., J. Chem. Phys., 52, 693 (1970).
• 3. Gubbins K.E., J. Chem. Phys., 48, 1404 (1968).
• 4. Keshavarzi E., Parsafar G. and Najafi B., Int. J. Thermophys., 20, 643 (1999).
• 5. Maitland G.C. and Wakeham W.A., Mol. Phys., 35, 1443 (1978).
• 6. Trusler J.P.M., Physical Acoustics and Metrology of Fluids, Adam Hilger, Bristol, 1991.
• 7. Ramos J.E., Del Rio F. and Estranda-Alexanders F., Int. J. Thermophys., 20, 631 (1999).
• 8. Parsafar G., Kermanpour F. and Najafi B., J. Phys. Chem. B, 103, 7287 (1999).
• 9. Attard P. and Parker J.L., Phys. Rev. A, 46, 7959 (1992).
• 10. Del Rio F., Ramos J.E., Gil-Villegas A. and Mclure I.A., J. Phys. Chem., 100, 9104 (1996).
• 11. Song Y. and Mason E.A., J. Chem. Phys., 91, 7840 (1989).
• 12. Mclure I.A., Ramos J.E. and Del Rio F„ J. Phys. Chem. B, 103, 7019 (1999).
• 13. Ramos J.E., Del Rio F. and Mclure I.A., Phys. Chem. Chem. Phys., 3,2634 (2001).
• 14. Del Rio F., Ramos J.E. and Mclure I.A., Phys. Chem. Chem. Phys., 1,4937 (1999).
• 15. Reed T.M. and Gubbins K.E., Applied Statistical Mechanics, Chemical Engineering Series of Fluids, McGraw-Hill, NY, 1973.
• 16. Dymond J.H. and Smith E.B., The Virial Coefficients of Pure Gases and Mixtures. A Critical Compila¬tion, Oxford University, NY, 1980.
• 17. Stewart R.B. and Jacobsen R.T., J. Phys. Chem. Ref. Data, 18, 639 (1989).
• 18. Goodwin R.D., J. Phys. Chem. Ref. Data, 14, 849 (1985).
• 19. Jacobsen R.T., Stewart R.B. and Jahangiri M., J. Phys. Chem. Ref. Data, 15, 735 (1986).
• 20. Younglove B.A. and Ely J.F., J. Phys. Chem. Ref. Data, 16, 577 (1987).
• 21. Sifner O. and Klomfar J., J. Phys. Chem. Ref. Data, 23, 63 (1994).
• 22. Span R. and Wagner W., J. Phys. Chem. Ref. Data, 25, 1509 (1996).
• 23. Goodwin R.D., J. Phys. Chem. Ref. Data, 16, 799 (1987).
• 24. Goodwin R.D., J. Phys. Chem. Ref. Data, 17, 1541 (1988).
• 25. Kutney M.C., Reagan M.T., Smith K.A., Tester J.W. and Herschbach D.R., J. Phys. Chem. B, 104,9513 (2000).
• 26. Brandi H„ Z. Phys. Chem., 260, 174 (1979).
• 27. Keshavarzi E. etal. presented in 17th IUPAC Conference on Chemical Thermodynamics, 2002, p. 25.