Using fundamental equations of state for calculating the thermodynamic properties of normal undecane

Александров, И С; Gerasimov, A. A.; Grigor'ev, B. A.

doi:10.1134/s0040601511080027

Cited by 14 publications

(12 citation statements)

References 26 publications

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“…The development of the correlation requires densities; Aleksandrov et al . 23 in 2011 published an accurate, wide-ranging equation of Helmholtz-energy equation of state that is valid from the triple point up to 700 K and 500 MPa, with densities below 776.86 kg m −3 , with an uncertainty in saturated liquid density of 0.05–0.15%; saturated vapor density, 0.2–0.4% at temperatures below 500 K, while at higher temperatures the uncertainty reaches 3–4%; liquid-phase density, 0.1–0.3%; gaseous-phase density, 0.20–0.35%; and heat capacities 0.4–0.8%. We also adopt the values for the critical point from their equation of state; the critical temperature, T c , and the critical density, ρ c , are 638.8 K and 236.7914 kg m −3 , respectively.…”

Section: Viscosity Methodologymentioning

confidence: 99%

“…We also adopt the values for the critical point from their equation of state; the critical temperature, T c , and the critical density, ρ c , are 638.8 K and 236.7914 kg m −3 , respectively. 23 The triple-point temperature resulting from critically evaluating available literature data is 247. 606 K. 38 …”

Section: Viscosity Methodologymentioning

confidence: 99%

“…(7), and subtracted from the experimental viscosity to obtain the residual term. The density values employed were obtained by the equation of state of Aleksandrov et al 23 The final equation obtained was…”

Section: Viscosity Methodologymentioning

confidence: 99%

“…The development of the correlation requires accurate values for the density, and as was done with the viscosity correlation, we use the 2011 published EOS of Aleksandrov et al 23 to provide densities.…”

Section: Thermal Conductivity Methodologymentioning

confidence: 99%

“…The ideal-gas isobaric heat capacity per molecule,

C_{p}^{normalo} (= C_{int}^{normalo} + 2.5 k_{normalB})

in (J/K), can be obtained from Aleksandrov et al 23 as…”

Section: Thermal Conductivity Methodologymentioning

confidence: 99%

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Reference Correlations for the Viscosity and Thermal Conductivity of n-Undecane

Assael

Papalas

Huber

2017

Journal of Physical and Chemical Reference Data

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This paper presents new wide-ranging correlations for the viscosity and thermal conductivity of n-undecane based on critically evaluated experimental data. The correlations are designed to be used with a recently published equation of state that is valid from the triple point to 700 K, at pressures up to 500 MPa, with densities below 776.86 kg m−3. The estimated uncertainty for the dilute-gas viscosity is 2.4%, and the estimated uncertainty for viscosity in the liquid phase for pressures up to 60 MPa over the temperature range 260 K to 520 K is 5%. The estimated uncertainty is 3% for the thermal conductivity of the low-density gas, and 3% for the liquid over the temperature range from 284 K to 677 K at pressures up to 400 MPa. Both correlations behave in a physically reasonable manner when extrapolated to the full range of the equation of state, however care should be taken when using the correlations outside of the validated range. The uncertainties will be larger outside of the validated range, and also in the critical region.

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Section: Viscosity Methodologymentioning

confidence: 99%

Section: Viscosity Methodologymentioning

confidence: 99%

Section: Viscosity Methodologymentioning

confidence: 99%

Section: Thermal Conductivity Methodologymentioning

confidence: 99%

“…The ideal-gas isobaric heat capacity per molecule,

C_{p}^{normalo} (= C_{int}^{normalo} + 2.5 k_{normalB})

in (J/K), can be obtained from Aleksandrov et al 23 as…”

Section: Thermal Conductivity Methodologymentioning

confidence: 99%

See 3 more Smart Citations

Reference Correlations for the Viscosity and Thermal Conductivity of n-Undecane

Assael

Papalas

Huber

2017

Journal of Physical and Chemical Reference Data

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Group Contribution Method for the Residual Entropy Scaling Model for Viscosities of Branched Alkanes

Mickoleit,

Jäger,

Grau Turuelo

et al. 2023

Int J Thermophys

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In this work it is shown how the entropy scaling paradigm introduced by Rosenfeld (Phys Rev A 15:2545–2549, 1977, https://doi.org/10.1103/PhysRevA.15.2545) can be extended to calculate the viscosities of branched alkanes by group contribution methods (GCM), making the technique more predictive. Two equations of state (EoS) requiring only a few adjustable parameters (Lee–Kesler–Plöcker and PC-SAFT) were used to calculate the thermodynamic properties of linear and branched alkanes. These EOS models were combined with first-order and second-order group contribution methods to obtain the fluid-specific scaling factor allowing the scaled viscosity values to be mapped onto the generalized correlation developed by Yang et al. (J Chem Eng Data 66:1385–1398, 2021, https://doi.org/10.1021/acs.jced.0c01009) The second-order scheme offers a more accurate estimation of the fluid-specific scaling factor, and overall the method yields an AARD of 10 % versus 8.8 % when the fluid-specific scaling factor is fit directly to the experimental data. More accurate results are obtained when using the PC-SAFT EoS, and the GCM generally out-performs other estimation schemes proposed in the literature for the fluid-specific scaling factor.

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