Estimation kinematic viscosity of biodiesel produced by ethanolysis

Suriya Phankosol

Department of Industrial and Technology Management, Faculty of Science and Technology, Bansomdejchaopraya Rajabhat University, Bangkok 10600, Thailand.

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and Kanit Krisnangkura

bDivision of Biochemical Technology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi (Bangkhuntien), Bangkok 10150, Thailand

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Manuscript received July 7, 2015

Revised September 4, 2015

Abstract

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.

Keywords: Biodiesel, Fatty acid ethyl ester, Kinematic viscosity, Estimation, Thermodynamic parameters

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