Papers by Noureddine Ouerfelli
Estimation and knowledge of transport properties of fluids are essential for heat and mass flow. ... more Estimation and knowledge of transport properties of fluids are essential for heat and mass flow. Viscosity is one of the important properties which are affected by temperature and pressure.
Fluid Phase Equilibria, 2014
ABSTRACT Estimation and knowledge of transport properties of fluids are essential for heat and ma... more ABSTRACT Estimation and knowledge of transport properties of fluids are essential for heat and mass flow. Viscosity is one of the important properties which are affected by temperature and pressure. In the present work, based on the use of econometric and statistical techniques for parametric and non-parametric regression analysis and statistical correlation tests, we propose an equation modeling the relationship between the two parameters of viscosity Arrhenius-type equation, such as the Arrhenius energy (Ea) or the pre-exponential factor (As). In addition, we introduce a third interesting parameter called Arrhenius temperature (TA), to enrich the discussion. Empirical validation using 48 data set of pure solvents from the literature and studied at different temperature ranges gives excellent statistical results which allow us to redefine the Arrhenius equation using a single parameter instead of two ones. In addition, the proposed model is very useful for engineering data and permits to estimate one non-available parameter when the second one is available.
Journal of Solution Chemistry, 2015
Calculations of Viscosity Arrhenius activation energy and derived partial molar properties from l... more Calculations of Viscosity Arrhenius activation energy and derived partial molar properties from literature experimental values of viscosity in isobutyric acid + water binary mixtures from 302.15 K to 313.15 K are presented here. The close similarity between the values of the Arrhenius activation energy Ea and the enthalpy of activation of viscous flow H* lead us to define partial molar activation energy Ea1 and Ea2 for isobutyric acid and water respectively along with their individual contribution separately. Correlation between the two Arrhenius parameters of viscosity in all compositions shows existence of two main distinct behaviors separated by the mole fraction in isobutyric acid equal to 0.1114. In addition, we add that correlation between Arrhenius parameters reveals interesting Arrhenius temperature which is closely related to the vaporization temperature in the liquid vapor equilibrium and the limiting corresponding partial molar properties can permit us to predict the boiling points of the pure components.
Physics and Chemistry of Liquids, 2014
Excess properties calculated from literature values of experimental density and viscosity in N,Nd... more Excess properties calculated from literature values of experimental density and viscosity in N,Ndimethylacetamide + methanol binary mixtures (from 303.15 to 318.15) K can lead us to test different correlation equations as well as their corresponding relative functions. Inspection of the Arrhenius activation energy Ea and the enthalpy of activation of viscous flow ∆H* shows very close values, here we can define partial molar activation energy Ea 1 and Ea 2 for N,N-dimethylacetamide and methanol respectively along with their individual contribution separately. Correlation between the two Arrhenius parameters of viscosity in all compositions shows existence of main distinct behaviors separated by particular mole fractions in N,N-dimethylacetamide. In addition, we add that correlation between Arrhenius parameters reveals interesting Arrhenius temperature which is closely related to the vaporization temperature in the liquid vapor equilibrium and the limiting corresponding partial molar properties can permit us to estimate the boiling points of the pure components.
Physics and Chemistry of Liquids, 2014
Physics and Chemistry of Liquids, 2014
On the viscosity Arrhenius temperature for methanol + N,N-dimethylformamide binary mixtures over ... more On the viscosity Arrhenius temperature for methanol + N,N-dimethylformamide binary mixtures over the temperature range from 303.15 K to 323.15 K.
Calculation of excess properties in 1,2-dimethoxyethane + propylene carbonate binary mixtures at ... more Calculation of excess properties in 1,2-dimethoxyethane + propylene carbonate binary mixtures at (298.15, 308.15 and 318.15) K from experimental density, viscosity and sound velocity values were presented in previous work. Applications of these experimental values to test different correlation equations as well as their corresponding relative functions were also reported. Considering the quasi-equality between the Arrhenius activation energy Ea and the enthalpy of activation of viscous flow H*, here we can define partial molar activation energy Ea1 and Ea2 for 1,2-dimethoxyethane with propylene carbonate respectively along with their individual contribution separately. Correlation between Arrhenius parameters reveals interesting Arrhenius temperature with a comparison to the vaporization temperature in the liquid vapor equilibrium, and the limiting corresponding partial molar properties that can permit us to estimate the boiling points of the pure components.
VISCOSITY ARRHENIUS ACTIVATION ENERGY AND DIFFERENT PROPERTIES IN N,N-DIMETHYLACETAMIDE+FORMAMIDE... more VISCOSITY ARRHENIUS ACTIVATION ENERGY AND DIFFERENT PROPERTIES IN N,N-DIMETHYLACETAMIDE+FORMAMIDE SYSTEMS AT DIFFERENT TEMPERATURES M. Dallel a, M. Hichri b, E.S. Bel Hadj Hmida c, D. Das d, M.A. Alkhaldi e, N. Ouerfelli a,e. b) Université de Tunis El Manar, Laboratoire Biophysique et de Technologies Médicales LR13ES04, Institut Supérieur des Technologies Médicales de Tunis, 9 Avenue Dr. Zouhaier Essafi 1006 Tunis, Tunisie.; b) Université de Tunis El Manar, Faculté des Sciences de Tunis, LR01SE10, Laboratoire de Thermodynamique Appliquée, Département de Chimie, 2092 Tunis, Tunisie. c) Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire, 2092 El Manar, Tunisie. d) Department of Chemistry, Dinhata College, North Bengal University, Dinhata-736135, Cooch-Behar, West Bengal, India.; e) University of Dammam, Department of Chemistry, College of Science, P.O. Box 1982, Dammam 31441, Saudi Arabia.; abstract : Calculati...
ETUDE DE L’EFFET DE LA TEMPERATURE D’ARRHENIUS SUR LA VISCOSITE DES SOLVANTS PURS ET MIXTES M. Da... more ETUDE DE L’EFFET DE LA TEMPERATURE D’ARRHENIUS SUR LA VISCOSITE DES SOLVANTS PURS ET MIXTES M. Dallel a, M. Hichri b, H. Hamda c, A.A. Al-Arfaj d, N.O. Alzamil d, N. Ouerfelli a,d. a) Université de Tunis El Manar, Laboratoire Biophysique et de Technologies Médicales LR13ES04, Institut Supérieur des Technologies Médicales de Tunis, 9 Avenue Dr. Zouhaier Essafi 1006 Tunis, Tunisie.; b)Université de Tunis El Manar, Faculté des Sciences de Tunis, LR01SE10, Laboratoire de Thermodynamique Appliquée, Département de Chimie, 2092 Tunis, Tunisie. c) Laboratoire d’Ingénierie Mathématique, Ecole Polytechnique de Tunisie, Université de Carthage, Rue El Khawarizmi, B.P.743, 2078 La Marsa, Tunisia. d) University of Dammam, Department of Chemistry, College of Science, P.O. Box 1982, Dammam 31441, Saudi Arabia.; abstract: Les mélanges binaires et ternaires occupent une grande place dans les domaines de Chimie Appliquée. Les grandeurs physico-chimiques des mélanges liquides sont importantes pour comp...
Based on the same experimental data of shear viscosities and densities of DMA + Met binary mixtur... more Based on the same experimental data of shear viscosities and densities of DMA + Met binary mixtures at four different temperatures from 303.15 to 318.15 K and at atmospheric pressure Based on the same experimental data of shear viscosities and densities of DMA + Met binary mixtures at four different temperatures from 303.15 to 318.15 K and at atmospheric pressure [1], some new theoretical approaches have been reported, for improving investigations of variation of Arrhenius activation energy and derived partial molar properties versus molar fraction composition. Arrhenius parameters of pure components (DMA and Met) as a function of temperature can be estimated. Correlation between the two Arrhenius parameters for binary mixtures permits us to reveal the viscosity Arrhenius temperature which characterizes the studied binary liquid mixture and can provide information on the vaporization temperature of the isobaric liquid vapor equilibrium. Also, this correlation can give evidence of the existence of distinct composition regions with different behaviours. Thus, supposing that the activation energy is a thermodynamic magnitude, we have determined the partial molar activation energy to release individual interaction's contributions of each pure component within the mixture for each well-defined composition. Correlation between the molar quantities relative to the activation energies and the logarithm of the entropic factors of Arrhenius for DMA + Met mixtures over the temperature range can give a roughly linear behavior i.e. no observable change in curvature. This quasi-straight line behavior suggests us to make an empirical equation by introducing a new parameter T A denoted as viscosity Arrhenius temperature which characterizes each binary system. In the case of molar quantities, we consider that the Arrhenius temperature (T A ) is no longer a constant over the whole range of composition, we introduce a new concept of the Arrhenius' current temperature (T Ai ) for each pure component (i) to find its value at the two extreme positions i.e., at very high concentration and very high dilution respectively. The results derived in the studied binary system gives an interesting fact that the isobaric boiling point (T bi ) of the pure components is very close or strongly depends upon the viscosity Arrhenius' current temperature (T Ai ). In conclusion, we can ascertain that with more mathematical
Among the physicochemical properties of binary liquid mixtures, viscosity is valuable tool for de... more Among the physicochemical properties of binary liquid mixtures, viscosity is valuable tool for developing theoretical models to understand the liquid state and structure. On the other hand, excess thermodynamic properties and deviations of analogous non-thermodynamic functions of liquid mixtures are fundamental for investigating different types of intermolecular interactions in these mixtures. Hence, the knowledge and prediction of physicochemical and thermophysical properties of binary liquid mixtures is of great importance for understanding and characterization of intermolecular interactions. In the same context, some models attempt to correlate shear viscosity in liquid mixtures to release information on eventual interactions, structure and peculiar behaviors.
Physics and Chemistry of Liquids, 2014
2 3 Viscosité des liquides purs. 4 5 6 Introductio n Les mélanges binaires et ternaires occupen... more 2 3 Viscosité des liquides purs. 4 5 6 Introductio n Les mélanges binaires et ternaires occupent une grande place dans les domaines de Chimie Appliquée La recherche, menée sur les propriétés des mélanges des liquides, a porté dans un premier temps sur la compréhension de leurs propriétés physico-chimiques. La viscosité La viscosité dynamique: La viscosité cinématique : Viscosité spécifique : Viscosité réduite : Viscosité intrinsèque : Viscosité relative : Dans l'industrie chimique, les industries alimentaires, cosmétiques et pharmaceutiques Pour les calculs hydrauliques de transport de fluides. Pour les calculs de transfert d'énergie. Les opérations de filtration, de pompage et de transvasement des liquides. La pulvérisation (peintures et vernis).
Supplement extended Abstract of funded Proposal research project 2014207 in Deanship of Scientifi... more Supplement extended Abstract of funded Proposal research project 2014207 in Deanship of Scientific Research of University of Dammam, Saudi Arabia.
In transport phenomena, precise knowledge or estimation of fluids properties are necessary, for m... more In transport phenomena, precise knowledge or estimation of fluids properties are necessary, for mass flow and heat transfer computations. Viscosity is one of the important properties which are affected by pressure and temperature. In the present work, based on statistical techniques for non linear regression analysis, we propose a novel equation modeling the relationship between the two parameters of viscosity Arrhenius-type equation, such as the energy (Ea) and the preexponential factor (As). Empirical validations, using about 90 data set of viscosity of pure solvents studied at different temperature ranges are provided from literature, give excellent statistical correlations, thus allowing us to rewrite the Arrhenius equation using a single parameter instead of two. Then, taking some mathematical considerations, we try in the present work to suggest an empirical exponential law-type equation valid even for the very viscous fluids (Ea < 40 kJ· mol-1) and (-20 < ln(As /Pa·s)). In addition, we have tried to give some physical meaning of the proposed equation parameters. Also, the suggested model is very beneficial for engineering data since it would permit to estimate the missing parameter value, if a well established estimate of the other is readily available.
Journal of Chemical & Engineering Data, 2009
Salt-induced phase separation of 1, 4-dioaxane (D) + water (W) with KCl has been investigated by ... more Salt-induced phase separation of 1, 4-dioaxane (D) + water (W) with KCl has been investigated by measuring the electrical conductivity and the refractive index (n) along the coexisting curve, in the vicinity and far from the lower critical solution temperature ( LCST) using a conductometer and refractometer.By visual method the lower critical temperature T c was determined as (311.032 ± 0.015) K, give the mole fraction of dioxane: x D = n D /(n D + n W ) = 0.295 ± 0.002.
Journal of Solution Chemistry, 2009
Shear viscosity deviation have been investigated by using density () and kinematic viscosity ... more Shear viscosity deviation have been investigated by using density () and kinematic viscosity () measurements for isobutyric acid + water (IBA+W) mixtures over the entire range of mole fractions at atmospheric pressure and in two different temperatures (301.15 K and 315.15 K) to expand the temperature range of five other temperatures investigated in previous work, both far and close to the critical temperature (1.055 K ≤ (T -T c ) ≤ 14.055 K. This system exhibited very large positive values of η due to increased hydrogen bonding interactions and correlation length between unlike molecules in the critical region and to very large differences between the molar volumes of the pure components at low temperatures. The results were also fitted with the Redlich-Kister polynomial equations and the recently proposed Herráez correlation equation. Competition between the two models at different temperatures and parameters numbers is discussed. We note that, in this system, where the shear viscosity as a function of molar fraction (x 1 ) of IBA presents a maximum, experimental data are in agreement with the two correlation models when more than three parameters are employed, especially for temperatures far from critical temperature. 2 = 0.1114 (implying a precision of 0.025 %) critical mole fraction. We choose the binary fluid of (IBA-W) for the following reasons: Since their component densities are very close to each other, this mixture does not have density gradients induced by gravity. The critical temperature T c of (IBA-W) is low.
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Papers by Noureddine Ouerfelli