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Correlating the speed of sound with the Gibbs energy and estimating the speed of sound in fatty acid methyl ester and biodiesel
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  • Apinya Cheewaphan,
  • Ubol Chuensumran,
  • Suriya Phankosol,
  • Kornkanok Aryusuk,
  • Supathra Lilitchan,
  • Kanit Krisnangkura
Apinya Cheewaphan
King Mongkut's University of Technology Thonburi
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Ubol Chuensumran
Suan Dusit University
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Suriya Phankosol
Bansomdejchaopraya Rajabhat University
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Kornkanok Aryusuk
King Mongkut's University of Technology Thonburi
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Supathra Lilitchan
Mahidol University
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Kanit Krisnangkura
King Mongkut's University of Technology Thonburil
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Abstract

The relation between the speed of sound (u) in biodiesel and the change in Gibbs energy (G) has not been described in the literature. With the method of Gibbs energy additivity, the relation between u and G can be expressed as ln(u2) = G/RT + A, where R is the universal gas constant, T is the absolute temperature, and A is a constant. Further expansion of G into its enthalpy and entropy, and sub-dividing the molecule of a fatty and methyl ester (FAME) into groups of atoms, the final model is good for estimating the speed of sound in both FAME and biodiesel at various temperatures. Only the numbers of double bonds and carbon atoms of the fatty acid are required for the calculation.

Peer review status:UNDER REVIEW

30 Aug 2020Submitted to Journal of the American Oil Chemists' Society
31 Aug 2020Assigned to Editor
31 Aug 2020Submission Checks Completed
07 Sep 2020Reviewer(s) Assigned