Measurement, correlation and prediction of biodiesel blends viscosity

Geacai, Sibel; Iulian, Olga; Nita, Irina

doi:10.1016/j.fuel.2014.11.041

Cited by 49 publications

(24 citation statements)

References 32 publications

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“…Biodiesel was synthesized in the laboratory as presented in [17]. Some properties of these fuels used in the measurements are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Estimation of the refractive index of diesel fuel+biodiesel blends

Nita

Geacai

Neagu

et al. 2013

Analele Universitatii "Ovidius" Constanta - Seria Chimie

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For now, biodiesel is the commonly accepted biofuel as a substitute for diesel fuel in internal combustion engines. Diesel fuel blends with up to 20% biodiesel can be used in diesel engines without any modification. A lot of studies regarding diesel fuel+biodiesel blends properties are presented in the literature. Some of the important properties of diesel fuel+biodiesel blends can be evaluated from other blends properties. For example, density and viscosity of biodiesel blends can be predicted based on blend refractive index. More than that, refractive index can be used as a reliable physical property to predict transesterification reaction progress. As a result, the refractive index of diesel fuel+biodiesel blends is important in order to characterize these blends or to monitor the evolution of transesterification process of vegetable oils or animal fats. The refractive index of diesel fuel+biodiesel blends can be experimentally determined or evaluated based on refractive indices of diesel fuel and biodiesel. The aim of this study was to estimate the accuracy of refractive index of diesel fuel +biodiesel blends calculation, using models initially proposed to evaluate the refractive index of a binary liquid mixture. It was shown that the refractive index of diesel fuel+biodiesel blends can be accurately predicted from refractive indices of the components of the blend. Wiener, Heller and Edward equations can be recommended to predict with a great accuracy the refractive index of diesel fuel+biodiesel blends.

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“…Biodiesel was synthesized in the laboratory as presented in [17]. Some properties of these fuels used in the measurements are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Estimation of the refractive index of diesel fuel+biodiesel blends

Nita

Geacai

Neagu

et al. 2013

Analele Universitatii "Ovidius" Constanta - Seria Chimie

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“…The density of the blends in this work was measured at a controlled temperature of 15 • C according to the ASTM D941 standard. Kinematic viscosity is one of the most important parameters considered while selecting a fuel for an internal combustion engine as it affects the fuel injection system especially at low temperature increases [16]. Viscosity is defined as the extent to which a fluid resists a tendency to flow.…”

Section: Methodsmentioning

confidence: 99%

“…The cloud point of the blends in this work was determined according to the ASTM D2500 method. Pour point is the temperature at which a fuel loses its ability to flow and the wax becomes semisolid, like a gel losing its flow potential [16][17][18][19]. The pour point of the blends in this work was determined according to the ASTM D97 method.…”

Section: Methodsmentioning

confidence: 99%

“…RI(x) = −0.000113232 x + 1.466575205 (16) Chem Engineering 2017, 1, x FOR PEER REVIEW 8 of 11 Figure 6 shows the experimental and predicted (Equation (15)) refractive index values for the biodiesel blends. It was observed that the refractive index (RI) decreases as the biodiesel content increases for both experimental and predicted data.…”

Section: Refractive Indexmentioning

confidence: 99%

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The Effect of Off-Spec Canola Biodiesel Blending on Fuel Properties for Cold Weather Applications

2018

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Biodiesel is a renewable and reduced-emission alternative fuel produced mainly from the alcoholysis of vegetable oils and/or animal fats. It is mainly used in blends with diesel fuel to reduce emissions, enhance lubrication and lower sulfur content. Being able to accurately determine the physicochemical properties of blended fuel is important for optimal injection, combustion, and lubricating performance in diesel engines. Also, fuel properties vary as the ratio of biodiesel-diesel changes, affecting the final fuel quality. In this study, a wide range and narrow intervals of (0,2,4,6,8,10,12,15,18,20, 25, 35, 50, 75 and 100% by volume) off-quality canola-based biodiesel blends were prepared at ambient conditions and used to study the blended fuel properties (density, kinematic viscosity, flash point, cloud point and pour point). This is particularly important for examining the effect of a biodiesel content of more than 20%-the industry maximum blend content-on cold flow properties, fuel stability, energy value, and emissions. It was found that the kinematic viscosity and density increased linearly as the concentration of the biodiesel in the blend increases. The pour point and cloud point temperature showed a small increase up to 35% blending ratio and a rapid increase in temperature for biodiesel concentrations higher than 35%. Also, the flash point remained almost constant at an average value of 73 • C for blends less than 20%, above which the values for the flash point increased exponentially with biodiesel concentration. Furthermore, predictive correlations were developed for all tested fuel properties from regressing corresponding experimental data. All models exhibited excellent agreement with experimental data with an average absolute deviation of less than 5%.

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“…Biodiesel and its blends with petroleum-based diesel fuel can be used in diesel engines without any significant modification to the engine [2][3][4]. The advantages of biodiesel over petroleum diesel are improved lubricity, a higher flash point, lower toxicity, and biodegradability [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effects of storage period on kinematic viscosity and density of biodiesel and its blends with ultra-low-sulfur diesel fuel at constant storage temperature

Kassem¹,

Aktuğ²,

Özgenç³

et al. 2018

SGCE

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In this experimental work, the viscosity and density of methyl ester based waste cooking vegetablebiodiesel oils were investigated under varying temperature and blend ratio of ultra-low sulfur diesel summer (ULSDS). The transesterified fatty acid methyl ester of waste cooking vegetable oils collected from local restaurants and cafes was used as neat biodiesel. Six different fuel blends (5%, 10%, 15%, 20%, 50% and 80% by volume mixing with base biodiesel) were studied along with base ULSDS fuel and pure biodiesel. Tests for viscosity and density were performed in the temperature range -13℃ -90℃. It is found that pure biodiesel has the highest viscosity and density at a given temperature among biodiesel blends. Moreover, the density of each fuel sample decreases linearly with the increase in temperature. On the other hand, the viscosity decreases exponentially with the increasing temperature of each fuel sample. Moreover, the objective of this experimental work was to study the changes in the properties of biodiesel and the mixtures of the biodiesel with ULSDS during the long-term storage. The fuel samples were stored for 12 weeks at constant temperatures (40 ℃±1) and properties such as kinematic viscosity and density were periodically measured. The observations of the sample were tested every two weeks for a period of 12 weeks. Based on the experimental results, kinematic viscosity and density were increased upon extended storage by only small increments.

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Measurement, correlation and prediction of biodiesel blends viscosity

Cited by 49 publications

References 32 publications

Estimation of the refractive index of diesel fuel+biodiesel blends

Estimation of the refractive index of diesel fuel+biodiesel blends

The Effect of Off-Spec Canola Biodiesel Blending on Fuel Properties for Cold Weather Applications

Effects of storage period on kinematic viscosity and density of biodiesel and its blends with ultra-low-sulfur diesel fuel at constant storage temperature

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