Biodiesel Droplet Modified-libre-temporal Spatial Variation
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1 Multicomponent Evaporation Model for Pure and Blended Biodiesel Droplets in High Temperature Convective Environment Kaushik Saha, Ehab Abu-Ramadan and Xianguo Li* Mechanical and Mechatronics Engineering Department, University of Waterloo 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1 * Corresponding Author: [email protected] ABSTRACT Biodiesel and more often its blends have been extensively used to mitigate the dependence on fossil fuel and the greenhouse gas emissions. However, a good understanding of the impact of the difference in the thermophysical properties of biodiesel and its blends from those of petroleum diesel is required to reap the benefits of biodiesel utilization. In this study a multicomponent evaporation model has been developed for pure and blended biodiesel droplets to investigate their evaporation characteristics in high temperature convective environment as encountered in practical combustion systems; and it is validated through a comparison with experimental resu lts. The vaporization charac teristics of pure diesel, pure biodiesel fuel droplets as well as the effect of mixing them in different proportions (B20 and B50) are p resented. The results reveal tha t biodiesel droplets evaporate a t a slower rate than the diesel droplets because of biodiesel’s relatively low vapor pressure. Consequently, the blending of diesel fuel with small proportions of biodiesel results in an increase in the evaporation timescale of the blended fuel droplets. Diffusion in the liquid phase is observed to be the rate controlling factor for blended droplet vaporization. The possibility of internal gasification for blended droplets is also investigated. A droplet with higher quantity of diesel is more prone to undergo internal gasification but micro-explosion is not likely to occur at atmospheric pressure. Keywords: multicomponent droplet evaporation, biodiesel, alternative fuel, diesel-biodiese l blends.
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![Modelling of biodiesel fuel droplet heating and …...6 [3, 4]. The use of biodiesel fuel is expected to contribute to the reduction of global warming [5]. Also, using 7 biodiesel](https://static.fdocuments.in/doc/165x107/5e99323de1188d0cbb491725/modelling-of-biodiesel-fuel-droplet-heating-and-6-3-4-the-use-of-biodiesel.jpg)
