Viscosity Measurement of Endothermic Fuels at Temperatures from 303 K to 673 K and Pressures up to 5.00 MPa

Yang, Zhuqiang; Bi, Qincheng; Feng, Song

doi:10.1021/acs.jced.6b00391

Cited by 9 publications

(7 citation statements)

References 34 publications

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“…More recent experimental viscosity data for n -C 12 H 26 at or close to saturation conditions are generally determined only around ambient temperature below 323 K , or agree with our present results within combined uncertainties . Further recently published experimental data from Yang et al were obtained over an extended temperature range from 303 to 673 K in the compressed liquid phase at 5 MPa. For temperatures between 323 and 573 K studied in our measurements, the relative deviations between the data of Yang et al measured by a thermal expansion method and the correlation according to eq increase from +4.2% at 323.2 K to +16.4% at 573.2 K. The larger viscosities for the data of Yang et al compared to our data are reasonable due to the larger pressure in their measurements, and are in agreement with the correlation of Huber et al within combined uncertainties.…”

Section: Resultsmentioning

confidence: 99%

Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering

et al. 2017

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The present contribution provides experimental data for the liquid viscosity and surface tension of n-alkane based model systems at temperatures up to 573 K. The fundamental advantage of the used surface light scattering (SLS) method lies in its application in thermodynamic equilibrium without calibration in a contactless way. The investigated systems comprise the pure fluids n-dodecane (n-C 12 H 26 ) and n-octacosane (n-C 28 H 58 ), their binary mixture at a n-C 12 H 26 mole fraction of about 0.3, and the commercially available hydrocarbon wax SX-70 representing a multicomponent mixture of n-alkanes with a broad chain length distribution. For the first time, it could be demonstrated that the SLS method can simultaneously access the liquid viscosity and surface tension of such medium-to long-chained n-alkane systems close to saturation conditions over a broad temperature range from 323 to 573 K. Typical measurement uncertainties of 2% based on a coverage factor k = 2, i.e., a level of confidence of more than 95%, were obtained. Over the entire temperature range, a simple polynomial equation for the dynamic viscosity and a modified van der Waals equation for the surface tension represent the measured data of the pure and binary systems well. The present investigations improve the data situation for hydrocarbon systems in the high-temperature range where no measurement results exist in literature.

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Section: Resultsmentioning

confidence: 99%

Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering

et al. 2017

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“…Caudwell et al 73,75 ; , Yang et al 79 (e) octane: , Caudwell et al 18 ; , Badalyan and Rodchenko 76 ; , Stephen and Heckelberger. 82…”

Section: Pure Fluidsmentioning

confidence: 99%

“…These data span temperatures from (298 to 473)K and pressures from (0.1 to 200) MPa. Additional experimental data were added for from several previous works: octane 76 , decane 77,78 , dodecane 79 and m-xylene 30,80 . The criterion for selecting the hydrocarbons were based upon the availability of both reliable wide-ranging viscosity data and a wide-range Helmholtz equation of state.…”

Section: Pure Fluidsmentioning

confidence: 99%

Residual entropy model for predicting the viscosities of dense fluid mixtures

Taib

Trusler

2020

The Journal of Chemical Physics

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In this work, we have investigated the monovariate relationship between reduced viscosity and residual entropy in pure fluids and in binary mixtures of hydrocarbons and hydrocarbons with dissolved carbon dioxide. The mixtures considered were octane + dodecane, decane + carbon dioxide and 1,3-dimethylbenzene (m-xylene) + carbon dioxide. The reduced viscosity was calculated according to the definition of Bell, while the residual entropy was calculated from accurate multi-parameter Helmholtz-energy equations of state and, for mixtures, the multi-fluid Helmholtz energy approximation. Mono-variant dependence of reduced viscosity upon residual molar entropy was observed for the pure fluids investigated and, by incorporating two scaling factors (one for reduced viscosity and the other for residual molar entropy), the data were represented by a single universal curve. To apply the method to mixtures, the scaling factors were determined from a mole-fraction weighted sum of the purecomponent values. This simple model was found to work well for the systems investigated. The average absolute relative deviation (AARD) was observed to be between 1 % and 2 % for pure components and a mixture of similar hydrocarbons. Larger deviations, with AARDs of up to 15 %, were observed for the asymmetric mixtures but this compares favourably with other methods for predicting the viscosity of such systems. We conclude that the residualentropy concept can be used to estimate the viscosity of mixtures of similar molecules with high reliability and that it offers a useful engineering approximation even for asymmetric mixtures.

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“…Then, the combined relative expansion uncertainty of viscosity measurements was calculated with eq as 0.88 %–2.40 % (coverage factor k = 2). The detailed structure and operation of the experimental system and concrete theory deduction can be found in a previous work of Yang et al , …”

Section: Experimental Sectionmentioning

confidence: 99%

Experimental Measurement of JP-10 Viscosity at 242.7–753.3 K under Pressures up to 6.00 MPa

Gong¹,

Zhang²,

et al. 2017

J. Chem. Eng. Data

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Viscosity under high temperatures and pressures is one of the most important thermophysical properties related to the heat-transfer calculation for fuel-cooled thermal management technology. The viscosities of a high-density hydrocarbon fuel JP-10 were measured using a two-capillary method at 242.7–753.3 K under 0.69–6 MPa. After the viscosity data of pure n-octane was measured and compared with the literature data, the measurement system was calibrated, and the average absolute deviation (AAD) and the maximum absolute deviation (MAD) were found to be 0.71% and 1.35%. Yaws’ equation and Bruno’s equation are used to correlate the experimental data. The results are that the correlation AAD for Yaws’ equation and Bruno’s equation are within 4.04% and 4.25% under all the test conditions, respectively.

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Viscosity Measurement of Endothermic Fuels at Temperatures from 303 K to 673 K and Pressures up to 5.00 MPa

Cited by 9 publications

References 34 publications

Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering

Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering

Residual entropy model for predicting the viscosities of dense fluid mixtures

Experimental Measurement of JP-10 Viscosity at 242.7–753.3 K under Pressures up to 6.00 MPa

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