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Numerical study of evaporation characteristics of biodiesel droplets of Indian origin
Published in Elsevier BV
Volume: 271

This paper presents comprehensive numerical simulations of evaporation of biodiesel droplets of Indian origin in air at atmospheric pressure under normal gravity conditions. A transient, two-phase and axisymmetric numerical model has been used for the simulations. Transport processes in liquid- and vapor-phases are solved along with interface coupling conditions. The influence of suspension bead on the droplet size and internal motion has also been considered in the model. Variable thermo-physical properties in both liquid- and vapor-phases, calculated as functions of temperature and species concentrations, are considered. Weber number has been chosen in a range where the droplet remains almost spherical throughout its lifetime. Evaporation characteristics of droplets of biodiesels such as methyl esters of karanja, jatropha, palma and mahua have been compared against the experimental data from literature. Two approaches are used: in the first, biodiesel is considered as a single-component fuel, which is a mixture of its fatty acid components. In the second approach, all the individual fatty acid components are separately considered and evaporation of a multi-component droplet has been simulated. Predicted flow, temperature and species fields in and around the droplet surface have been presented. A correlation based on long chain saturation factor is proposed.

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