Predicting and Correlating Speed of Sound in Long-Chain Alkanes at High Pressure

Daridon, Jean-Luc

doi:10.1007/s10765-022-02999-x

Cited by 11 publications

(9 citation statements)

References 112 publications

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“…Recently, Daridon , reported a new method to predict the speed of sound in both pure fatty acid alkyl esters and biodiesel fuels. They proposed where c is the speed of sound, x i and M i are the mole fraction and molar weight of ester i in the biodiesel, γ = 0.975, and cM γ, i is a Murnaghan-type equation where p ∼/MPa = p – 0.1 and parameters A , B , and C are functions of temperature. , …”

Section: Resultsmentioning

confidence: 99%

Pressure Effect on the Speed of Sound of Waste Cooking Oil Biodiesel

et al. 2022

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The knowledge of speed of sound for biodiesel mixed with diesel at high pressures and in a wide range of temperatures is important for optimizing the injection process in diesel engine operation. The experimental speed of sound data in the literature about biodiesel is scarce. For that reason, the authors tried to evaluate the influence of temperature and pressure on the speed of sound of used cooking oil biodiesel (UCO) over the temperature range of 303−343 K and pressure varying from atmospheric up to 25 MPa. For that purpose, an acoustic cell with two ultrasonic probes working in through-transmission was used for speed of sound measurement. The uncertainty for the measurements was estimated as 1.4 m•s −1 . New measurements for 1-butanol, used as a calibration test substance, are reported with good agreement with literature data, with 0.2% differences. Correlations for the speed of sound for 1-butanol and biodiesel were developed for pressure and temperature ranges with accuracy better than the measurement uncertainty. A very recent predictive method for the speed of sound of biodiesel was tested with the data of this work, resulting in average percent deviations of only 0.12%. Differences in the speed of sound between biodiesel and diesel are presented and discussed.

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Section: Resultsmentioning

confidence: 99%

Pressure Effect on the Speed of Sound of Waste Cooking Oil Biodiesel

et al. 2022

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“…It proved suitable for expressing speed of sound based on group additivity rules in a long-chain n-alkane family 39 when γ = 0.975. Compared to molar compressibility, this second property offers the advantage of involving only molecular weight in addition to speed of sound which adds no uncertainty.…”

Section: Predicting Speed Of Sound In Pure Fatty Acid Alkyl Esters Us...mentioning

confidence: 99%

“…The parameters of the two alkyl groups (−C 2 H 5 and −CH 2 −) were first determined using values previously established for pentyl (−C 5 H 11 ) and methylene (−CH 2 −) groups across an extended pressure range based on a data set of speeds of sound in high molecular weight alkanes. 39 The parameters associated with ester groups (−CH 3 COO and −C 2 H 5 COO) were then estimated using the data reported in Table S1 for all saturated components. Finally, the double-bond parameters were evaluated based on the data reported for methyl oleate and lineate, two unsaturated components for which speed of sound data obtained at high pressures are available.…”

Section: Predicting Speed Of Sound In Pure Fatty Acid Alkyl Esters Us...mentioning

confidence: 99%

“…In this case, it is necessary to find an alternative quantity related to the property studied and that follows the additivity rule of group contribution methods. In the specific case of speed of sound, it was observed in previous works ,, that two different quantities address these needs. The first is molar compressibility κ m also known as Wada’s constant .…”

Section: Predicting Speed Of Sound In Pure Fatty Acid Alkyl Esters Us...mentioning

confidence: 99%

“…The second property that can be considered for developing a group contribution method to predict speed of sound is the product of speed of sound w and molecular weight M raised to the power γ. This property noted wM γ is defined by a simple power transformation of the product of speed of sound and molecular weight: …”

Section: Predicting Speed Of Sound In Pure Fatty Acid Alkyl Esters Us...mentioning

confidence: 99%

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Predicting Speed of Sound in Fatty Acid Alkyl Esters and Biodiesels at High Pressure

Daridon

2022

Ind. Eng. Chem. Res.

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Knowing the thermophysical properties of biodiesels, in particular the speed of sound, over an extended pressure range is essential to optimize injection and combustion processes in diesel engines. The aim of the present work is therefore to propose a predictive method for estimating the speed of sound in biodiesel based on the fatty acid alkyl ester profile. For that purpose, a group contribution method was first developed to predict speed of sound in fatty acid alkyl ester compounds in target p, T ranges (293–423 K and 0.1–150 MPa). Then, using experimental data from the literature supplemented by group contribution predictions, a correlation was established to relate the speed of sound in fatty acid methyl and ethyl ester components to pressure and temperature. Finally, a combination rule was used to extend the pure fatty acid alkyl ester correlations to biodiesel fuels.

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Measurement and Modeling of Speed of Sound in Binary Mixtures of Methyl Oleate with n-Hexane or n-Decane Under Pressure

2023

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In this study, the speeds of sound were measured in binary liquid mixtures of methyl oleate and either n-hexane or n-decane at temperature T = 303.15 K and pressures ranging from 0.1 to 70 MPa. The data obtained from these measurements were used to calculate the excess speed of sound for these mixtures. The speed of sound molecular weight product, raised to a constant power 𝛾 was also calculated and represented as a function of molar percentage. This was done in order to determine a simple combining rule for representing the speed of sound of mixtures composed of n-alkanes and fatty acid alkyl esters.

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Predicting and Correlating Speed of Sound in Long-Chain Alkanes at High Pressure

Cited by 11 publications

References 112 publications

Pressure Effect on the Speed of Sound of Waste Cooking Oil Biodiesel

Pressure Effect on the Speed of Sound of Waste Cooking Oil Biodiesel

Predicting Speed of Sound in Fatty Acid Alkyl Esters and Biodiesels at High Pressure

Measurement and Modeling of Speed of Sound in Binary Mixtures of Methyl Oleate with n-Hexane or n-Decane Under Pressure

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