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Kinematic viscosity (µ) is an important physical property of biodiesel. It dictates fuel atomization and complete combustion in the diesel engine. The kinematic viscosity of biodiesel is correlated to number of carbon atoms, number of double bond(s) and temperature via the Martin’s rule of free energy additivity. In this work, proposed an empirical approach for estimation the kinematic viscosity of biodiesel based on free energy of viscous flow by a single empirical equation. The single empirical equation can be estimated without the prior knowledge of the kinematic viscosity of an individual fatty acid ethyl ester and can be estimated by using the average number of carbon atoms (zave) and average number of double bonds (nd(ave)) from its fatty acid composition. Data available in literatures are used to validate, and support the speculations derived from the proposed equation. The proposed equation is easy to use and the estimated kinematic viscosity values of fatty acid ethyl esters (FAEEs) at different temperatures agree well with the literature values.
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Faculty of Engineering and Technology
Mahanakorn University of Technology
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