Publication: Correlating the Speed of Sound with the Gibbs Energy and Estimating the Speed of Sound in Fatty Acid Methyl Ester and Biodiesel
Issued Date
2021-05-01
Resource Type
ISSN
0003021X
Other identifier(s)
2-s2.0-85101297792
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Mahidol University
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SCOPUS
Bibliographic Citation
JAOCS, Journal of the American Oil Chemists' Society. Vol.98, No.5 (2021), 593-604
Suggested Citation
Apinya Cheewaphan, Ubol Chuensumran, Suriya Phankosol, Kornkanok Aryusuk, Supathra Lilitchan, Kanit Krisnangkura Correlating the Speed of Sound with the Gibbs Energy and Estimating the Speed of Sound in Fatty Acid Methyl Ester and Biodiesel. JAOCS, Journal of the American Oil Chemists' Society. Vol.98, No.5 (2021), 593-604. doi:10.1002/aocs.12476 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/76536
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Title
Correlating the Speed of Sound with the Gibbs Energy and Estimating the Speed of Sound in Fatty Acid Methyl Ester and Biodiesel
Abstract
The relationship between the speed of sound (u) in biodiesel and the change in Gibbs energy (ΔG) has not been described in the literature. With the Gibbs energy additivity method, the relationship between u and ΔG can be expressed as ln(u2) = ΔG/RT + A, where R is the universal gas constant, T is the absolute temperature, and A is a constant. The molecule of fatty acid methyl ester (FAME) was arbitrarily sub-divided into groups of atoms and a ΔG was assigned to each group of atoms. A new model correlating the speed of sound to the structure of fatty acid was derived. The proposed model was good for estimation of the speed of sound in both FAME and biodiesel at various temperatures with good accuracy. The absolute average deviations for the speed of sound in FAME (65 data points) and in biodiesel (175 data points) were 0.23% and 0.36%, respectively. Only the number of double bonds and carbon atoms of the fatty acid are required for the calculation.