The impacts of the activity coefficient on heating and evaporation of ethanol/gasoline fuel blends

Al-Esawi, Nawar Hasan Imran; Qubeissi, Mansour Al; Sazhin, Sergei; Whitaker, Reece

doi:10.1016/j.icheatmasstransfer.2018.08.018

Cited by 25 publications

(30 citation statements)

References 34 publications

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“…In Table A1, there are six groups in ethanol, biodiesel, and diesel fuels, and each group interacts with the other five groups. In contrast to our previous work [39] volumes and surface areas of biodiesel fuels (methyl-esters). The a mn between these groups, including those for biodiesel fuel (group 11), are shown in Table A2 [40].…”

Section: Discussioncontrasting

confidence: 57%

“…In fact, AC is used to correct the vapor pressure of each individual component. The UNIFAC model is presented in greater detail in [39]. However, as this is the first study to deal with the UNIFAC model for the EBD blend to the best of our knowledge, we have included two tables in Appendix A for the UNIFAC groups' parameters and their interaction parameters [40].…”

Section: Modelmentioning

confidence: 99%

“…All the terms and parameters appearing in Equation 12and their related terms are the same as those for the UNIFAC model (see [39] for more details). The application of Equation (12) for the predictions of the EBD viscosity is summarized in Table 3.…”

Section: Cetane Number and Viscositymentioning

confidence: 99%

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The Impact of Biodiesel Fuel on Ethanol/Diesel Blends

2019

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The interest in biofuels was stimulated by the fossil fuel depletion and global warming. This work focuses on the impact of biodiesel fuel on ethanol/diesel (ED) fuel blends. The soybean methyl ester was used as a representative composition of typical biodiesel fuels. The heating and evaporation of ethanol–biodiesel–diesel (EBD) blends were investigated using the Discrete–Component (DC) model. The Cetane Number (CN) of the EBD blends was predicted based on the individual hydrocarbon contributions in the mixture. The mixture viscosity was predicted using the Universal Quasi-Chemical Functional group Activity Coefficients and Viscosity (UNIFAC–VISCO) method, and the lower heating value of the mixture was predicted based on the volume fractions and density of species and blends. Results revealed that a mixture of up to 15% biodiesel, 5% ethanol, and 80% diesel fuels had led to small variations in droplet lifetime, CN, viscosity, and heating value of pure diesel, with less than 1.2%, 0.2%, 2%, and 2.2% reduction in those values, respectively.

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Section: Discussioncontrasting

confidence: 57%

Section: Modelmentioning

confidence: 99%

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The Impact of Biodiesel Fuel on Ethanol/Diesel Blends

2019

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“…Density has an important relationship with weighted emission 23 . Because droplet lifetime hinges on the activity coefficient in heating and evaporation, the evaporation characteristics of fuel have a certain influence on the combustion process [24][25][26] . Latent heating reduces soot emissions via longer liquid penetration 27 .…”

Section: 5-dimethylfuran (Dmf) Is a Type Of Attractive Sustainable mentioning

confidence: 99%

Assessing fuel properties effects of 2,5-dimethylfuran on microscopic and macroscopic characteristics of oxygenated fuel/diesel blends spray

Zhang

Chen

et al. 2020

Sci Rep

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Abstract2,5-Dimethylfuran (DMF) is a type of attractive sustainable green energy for diesel engines that is designed to reduce soot emission. This study investigated the effect of fuel properties on the macroscopic and microscopic spray characteristics of four test blends under injection pressures of 90, 120 and 150 MPa and ambient pressure of 5 MPa in a common diesel rail injection system. The macroscopic results indicate that with higher density, lower viscosity and lower latent heating of DMF20, the spray tip penetration and spray area are increased and the average spray angle is slightly increased. Interestingly, the effect of latent heating on the average spray angle is more obvious than that of kinematic viscosity. The microscopic results suggest that higher density, lower viscosity and lower latent heating of DMF20 have an adverse effect on the breakup of small droplets. The results of comparative analysis show that the change rules of the spray parameters remain nearly unchanged with increased injection pressure, and the influence of DMF20 properties produces a different change in different spray parameters with increasing injection pressure. The meaningful conclusion is that the properties of DMF are favourable to improvement of the spray and atomization parameters under high injection pressure.

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“…60 In contrast to previous studies, we have calculated without approximations, using the multi-component universal quasi-chemical functional group activity coefficients (UNIFAC) model. 39 We have used the latter model for the prediction of the activity coefficients of 119 components of E85-diesel fuel blends: 61,62 ln ln ln , is the area fraction of group , is the molar fraction of group , and and are the Van der Waals surface areas and volumes for each functional group within a molecule, respectively, ‡ ‡ The structure of the groups and the values of and in E85-diesel fuel blends are the same as those shown in ref 39 for the ethanol-gasoline blend. Diesel fuel, however, has 5 more groups of molecules than gasoline fuel, namely, bicycloalkanes, naphthalenes, tricycloalkanes, diaromatics and phenanthrenes.…”

Section: Species At the Droplet Surfacementioning

confidence: 99%

Blended E85–Diesel Fuel Droplet Heating and Evaporation

et al. 2019

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The multi-dimensional quasi-discrete (MDQD) model is applied to the analysis of heating and evaporation of mixtures of E85 (85 vol. % ethanol and 15 vol. % gasoline) with diesel fuel, commonly known as 'E85diesel' blends, using the universal quasi-chemical functional group activity coefficients model for the calculation of vapor pressure. The contribution of 119 components of E85-diesel fuel blends is taken into account, but replaced with smaller number of components/quasi-components, under conditions representative of diesel engines. Our results show that high fractions of E85-diesel fuel blends have a significant impact on the evolutions of droplet radii and surface temperatures. For instance, droplet lifetime and surface temperature for a blend of 50 vol. % E85 and 50 vol. % diesel are 23.2% and up to 3.4% less than those of pure diesel fuel, respectively. The application of the MDQD model has improved the computational efficiency significantly with minimal sacrifice to accuracy. This approach leads to a saving of up to 86.4% of CPU time when reducing the 119 components to 16 components/quasi-components without a sacrifice to the main features of the model.

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The impacts of the activity coefficient on heating and evaporation of ethanol/gasoline fuel blends

Cited by 25 publications

References 34 publications

The Impact of Biodiesel Fuel on Ethanol/Diesel Blends

The Impact of Biodiesel Fuel on Ethanol/Diesel Blends

Assessing fuel properties effects of 2,5-dimethylfuran on microscopic and macroscopic characteristics of oxygenated fuel/diesel blends spray

Blended E85–Diesel Fuel Droplet Heating and Evaporation

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