Acta Univ. Agric. Silvic. Mendelianae Brun. 2015, 63(4), 1147-1151 | DOI: 10.11118/actaun201563041147

Temperature Dependence Viscosity and Density of Different Biodiesel Blends

Vojtěch Kumbár, Antonín Skřivánek
Department of Technology and Automobile Transport, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

The main goal of this paper is to assess the effect of rapeseed oil methyl ester (RME) concentration in diesel fuel on its viscosity and density behaviour. The density and dynamic viscosity were observed at various mixing ratios of RME and diesel fuel. All measurements were performed at constant temperature of 40 °C. Increasing ratio of RME in diesel fuel was reflected in increased density value and dynamic viscosity of the blend. In case of pure RME, pure diesel fuel, and a blend of both (B30), temperature dependence of dynamic viscosity and density was examined. Temperature range in the experiment was -10 °C to 80 °C. Considerable temperature dependence of dynamic viscosity and density was found and demonstrated for all three samples. This finding is in accordance with theoretical assumptions and reference data. Mathematical models were developed and tested. Temperature dependence of dynamic viscosity was modeled using a polynomial 3rd polynomial degree. Correlation coefficients R -0.796, -0.948, and -0.974 between measured and calculated values were found. Temperature dependence of density was modeled using a 2nd polynomial degree. Correlation coefficients R -0.994, -0.979, and -0.976 between measured and calculated values were acquired. The proposed models can be used for flow behaviour prediction of RME, diesel fuel, and their blends.

Keywords: biodiesel, density, viscosity, modeling
Grants and funding:

The research has been supported by the project No. TP 4/2014, financed by Internal Grant Agency of Mendel University in Brno, Faculty of Agronomy.

Prepublished online: September 2, 2015; Published: September 1, 2015  Show citation

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Kumbár, V., & Skřivánek, A. (2015). Temperature Dependence Viscosity and Density of Different Biodiesel Blends. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(4), 1147-1151. doi: 10.11118/actaun201563041147
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