An improved representation forn-alkane liquid densities

Assael, Marc J.; Dymond, J. H.; Exadaktilou, D.

doi:10.1007/bf01439252

Cited by 68 publications

(64 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exception is methanol, for which the curve lies significantly lower than that for ethanol, but this is not entirely unexpected since it has frequently been observed that the first member of a series shows anomalous behavior compared with other members of the series. A similar situation was noticed with the n-alkanes for methane [7].…”

Section: P-po=clog[ B+ P ]supporting

confidence: 70%

“…Parameter C has generally been found to be a constant, while parameter B definitely varies with temperature. In the case of n-alkane liquid density [7], C was found to be a constant equal to 0.2000 and B a quadratic function of temperature.…”

Section: P-po=clog[ B+ P ]mentioning

confidence: 96%

“…Following our previous work [7], the liquid density at atmospheric pressure was correlated as a function of the reduced temperature, Tr (= T/Tc), as [8] {° where Pc and Tc represent the critical density and critical temperature of the liquid. The coefficients a~ and the critical constants are shown in Table I.…”

Section: P-po=clog[ B+ P ]mentioning

confidence: 99%

“…To overcome this, a generalized Tait-type equation was employed to correlate successfully the density of n-alkanes [7]. This, in conjunction with the aforementioned scheme, allowed the calculation of the transport properties of n-alkanes and their mixtures as a function of the temperature and pressure, rather than the density.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Correlation and prediction of dense fluid transport coefficients. VI.n-alcohols

1994

Self Cite

View full text Add to dashboard Cite

A previously described method, based on considerations of hard-sphere theory, is used for the simultaneous correlation of the coefficients of viscosity, selfdiffusion, and thermal conductivity for the n-alcohols, from methanol to n-decanol, in excellent agreement with experiment, over extended temperature and pressure ranges. Generalized correlations are given for the roughness factors and the characteristic volume. The overall average absolute deviations of the experimental viscosity, self-diffusion, and thermal conductivity measurements from those calculated by the correlation are 2.4, 2.6, and 2.0%, respectively. Since the proposed scheme is based on accurate density values, a Tait-type equation was also employed to correlate successfully the density of the n-alcohols. The overall average absolute deviation of the experimental density measurements from those calculated by the correlation is +0.05%.

show abstract

Section: P-po=clog[ B+ P ]supporting

confidence: 70%

Section: P-po=clog[ B+ P ]mentioning

confidence: 96%

Section: P-po=clog[ B+ P ]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlation and prediction of dense fluid transport coefficients. VI.n-alcohols

1994

Self Cite

View full text Add to dashboard Cite

show abstract

“…The computed liquid densities are in a good agreement with earlier correlations. 55 Vapor pressure. The vapor pressure of saturated n-nonane has been discussed in detail by Hung et al 24 These authors recommended equation by King and Al-Najjar, 49 although a different correlation was used in a later study by Rudek et al 27 More recently, a generalized vapor pressure equation has been obtained by Lemmon and Goodwin 56 ͓their Eq.…”

Section: Appendix B: Thermophysical Properties Of N-nonanementioning

confidence: 99%

Gradient theory computation of the radius-dependent surface tension and nucleation rate for n-nonane clusters

Hrubý

Labetski

Dongen

2007

The Journal of Chemical Physics

View full text Add to dashboard Cite

The Van der Waals-Cahn-Hilliard gradient theory ͑GT͒ is applied to determine the structure and the work of formation of clusters in supersaturated n-nonane vapor. The results are analyzed as functions of the difference of pressures of the liquid phase and vapor phase in chemical equilibrium, which is a measure for the supersaturation. The surface tension as a function of pressure difference shows first a weak maximum and then decreases monotonically. The computed Tolman length is in agreement with earlier results ͓L. Gránásy, J. Chem. Phys. 109, 9660 ͑1998͔͒ obtained with a different equation of state. A method based on the Gibbs adsorption equation is developed to check the consistency of GT results ͑or other simulation techniques providing the work of formation and excess number of molecules͒, and to enable an efficient interpolation. A cluster model is devised based on the density profile of the planar phase interface. Using this model we analyze the dependency of the surface tension on the pressure difference. We find three major contributions: ͑i͒ the effect of asymmetry of the density profile resulting into a linear increase of the surface tension, ͑ii͒ the effect of finite thickness of the phase interface resulting into a negative quadratic term, and ͑iii͒ the effect of buildup of a low-density tail of the density profile, also contributing as a negative quadratic term. Contributions ͑i͒-͑iii͒ fully explain the dependency of the surface tension on the pressure difference, including the range relevant to nucleation experiments. Contributions ͑i͒ and ͑ii͒ can be predicted from the planar density profile. The work of formation of noncritical clusters is derived and the nucleation rate is computed. The computed nucleation rates are closer to the experimental nucleation rate results than the classical Becker-Döring theory, and also the dependence on supersaturation is better predicted.

show abstract

A new semi‐empirical equation for compressed liquid densities of n‐alkanes

Sun

Wang

Liu

2012

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

In this work, a new six‐parameter semi‐empirical equation has been developed for the predictions of the compressed liquid densities of n‐alkanes from C2 to C10. The resulting functional form was established with the quasi‐Newton optimization algorithm, which considers the experimental data sets for different fluids simultaneously. During the fitting process, the functional form of the equation is numerically very stable, and the substance‐specific coefficients can be obtained easily. The calculated values from the new model were compared with the available experimental data and the values from reference equations in the literature. In most cases, the deviations are not more than ±0.5% for temperatures up to 0.7 times the critical temperature, whereas the agreement is within ±1.0% in the temperature range from the triple point to the critical point at reduced pressure up to 15. It was shown that the new semi‐empirical equation was able to represent the compressed liquid densities of n‐alkanes in wide thermodynamic ranges. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.

show abstract

An improved representation forn-alkane liquid densities

Cited by 68 publications

References 29 publications

Correlation and prediction of dense fluid transport coefficients. VI.n-alcohols

Correlation and prediction of dense fluid transport coefficients. VI.n-alcohols

Gradient theory computation of the radius-dependent surface tension and nucleation rate for n-nonane clusters

A new semi‐empirical equation for compressed liquid densities of n‐alkanes

Contact Info

Product

Resources

About