Hilal Yucel - Academia.edu (original) (raw)
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Papers by Hilal Yucel
International Journal of Thermophysics, 2005
In this study, empirical and semi-theoretical methods for predicting the viscosity of binary mixt... more In this study, empirical and semi-theoretical methods for predicting the viscosity of binary mixtures of n-alkanes are presented at atmospheric pressure and in the temperature range from 288 to 333 K. In the empirical viscosity calculation method, a modified version of the Andrade equation and a simple mixture rule are used. The proposed semi-theoretical method employs both the Enskog's hard-sphere theory for dense fluids and the principle of corresponding states. The viscosities of binary mixtures of n-heptane with n-hexane and n-nonane covering different compositions were calculated using these methods which require only critical properties and the normal boiling point as input data. The predictions were compared with accurate experimental data in the literature. Highly satisfactory results were obtained. The percent average absolute deviations amount to 1.2 and 0.9% utilizing the empirical and semi-theoretical viscosity methods, respectively, for 27 data points.
Canadian Journal of Chemical Engineering, 1998
A new semi-theoretical method based on Enskog's hard sphere theory for dense fluids and the princ... more A new semi-theoretical method based on Enskog's hard sphere theory for dense fluids and the principle of corresponding states is presented for predicting viscosity of pure organic liquids. The viscosities of 75 organic liquids—37 acyclic and 38 cyclic hydrocarbons—were calculated using this method which requires critical properties and normal boiling point as input data. The predictions were compared with empirical data and other prediction methods. Highly satisfactory results were obtained over a wide range of temperatures (0.45 < Tr< 0.80).Une nouvelle méathode semi-théorique, s'appuyant sur la théorie des sphères dures d'Enskog pour des fluides denses et le principe des états correspondants, est présentée en vue de prédire la viscosité des liquides organiques purs. On a calculé les viscosités de 75 liquides organiques—37 hydrocarbures acycliques et 38 cycliques—au moyen de cette méthode, les propriétés critiques et le point d'ébullition normal étant utilisés comme donnees d'entrée. Les prédictions ont été comparées à des données empiriques et aux résultats d'autres methodes de prediction. Des resultats hautement satisfaisants ont été obtenus pour une vaste gamme de températures (0,45 < Tr < 0,80).
Analytica Chimica Acta, 2005
Heavy n-alkanes and their mixtures were characterized by high temperature-simulated distillation ... more Heavy n-alkanes and their mixtures were characterized by high temperature-simulated distillation using gas chromatography with a capillary column. In this work, the atmospheric boiling point is determined by the HT-SimDis GC method. In this study, molecular weights and density of n-alkanes were evaluated with this method by using retention times and normal boiling points as input data. ASTM D2887 calibration mixture containing 17 n-alkanes in the C 6 -C 44 range were used for qualitative analyses. Retention times (t R ) of n-alkanes were measured with this method. The other input data that normal boiling points (T b ) and molecular weight (M) had been taken in the literature. Experimental densities (at 20 • C) of n-alkanes were obtained from API Research Projects. Empirical molecular weight and density correlations were developed by using the nonlinear and multiple regressions with correlation coefficients. The results of calculations were compared with experimental data. Normal boiling point predictions were obtained as an average absolute deviation of 1.07%. Molecular weight and density results were evaluated as average absolute deviations of 0.68% and 0.21%, respectively.
International Journal of Thermophysics, 2005
In this study, empirical and semi-theoretical methods for predicting the viscosity of binary mixt... more In this study, empirical and semi-theoretical methods for predicting the viscosity of binary mixtures of n-alkanes are presented at atmospheric pressure and in the temperature range from 288 to 333 K. In the empirical viscosity calculation method, a modified version of the Andrade equation and a simple mixture rule are used. The proposed semi-theoretical method employs both the Enskog's hard-sphere theory for dense fluids and the principle of corresponding states. The viscosities of binary mixtures of n-heptane with n-hexane and n-nonane covering different compositions were calculated using these methods which require only critical properties and the normal boiling point as input data. The predictions were compared with accurate experimental data in the literature. Highly satisfactory results were obtained. The percent average absolute deviations amount to 1.2 and 0.9% utilizing the empirical and semi-theoretical viscosity methods, respectively, for 27 data points.
Canadian Journal of Chemical Engineering, 1998
A new semi-theoretical method based on Enskog's hard sphere theory for dense fluids and the princ... more A new semi-theoretical method based on Enskog's hard sphere theory for dense fluids and the principle of corresponding states is presented for predicting viscosity of pure organic liquids. The viscosities of 75 organic liquids—37 acyclic and 38 cyclic hydrocarbons—were calculated using this method which requires critical properties and normal boiling point as input data. The predictions were compared with empirical data and other prediction methods. Highly satisfactory results were obtained over a wide range of temperatures (0.45 < Tr< 0.80).Une nouvelle méathode semi-théorique, s'appuyant sur la théorie des sphères dures d'Enskog pour des fluides denses et le principe des états correspondants, est présentée en vue de prédire la viscosité des liquides organiques purs. On a calculé les viscosités de 75 liquides organiques—37 hydrocarbures acycliques et 38 cycliques—au moyen de cette méthode, les propriétés critiques et le point d'ébullition normal étant utilisés comme donnees d'entrée. Les prédictions ont été comparées à des données empiriques et aux résultats d'autres methodes de prediction. Des resultats hautement satisfaisants ont été obtenus pour une vaste gamme de températures (0,45 < Tr < 0,80).
Analytica Chimica Acta, 2005
Heavy n-alkanes and their mixtures were characterized by high temperature-simulated distillation ... more Heavy n-alkanes and their mixtures were characterized by high temperature-simulated distillation using gas chromatography with a capillary column. In this work, the atmospheric boiling point is determined by the HT-SimDis GC method. In this study, molecular weights and density of n-alkanes were evaluated with this method by using retention times and normal boiling points as input data. ASTM D2887 calibration mixture containing 17 n-alkanes in the C 6 -C 44 range were used for qualitative analyses. Retention times (t R ) of n-alkanes were measured with this method. The other input data that normal boiling points (T b ) and molecular weight (M) had been taken in the literature. Experimental densities (at 20 • C) of n-alkanes were obtained from API Research Projects. Empirical molecular weight and density correlations were developed by using the nonlinear and multiple regressions with correlation coefficients. The results of calculations were compared with experimental data. Normal boiling point predictions were obtained as an average absolute deviation of 1.07%. Molecular weight and density results were evaluated as average absolute deviations of 0.68% and 0.21%, respectively.