Diffusion and its effects on soot production in the combustion of emulsified and nonemulsified fuel droplets

Atul Kumar, Hsien-Wen Chen and Shouyin Yang

Energy, 2023, vol. 267, issue C

Abstract: Soot characteristics of emulsified and nonemulsified fuels and the effects of microexplosions on soot production were investigated by analyzing the soot extinction coefficient, burning rate, diffusion characteristics, and natural convection of fuels during droplet combustion. The experiments were conducted under normal atmospheric conditions, and the fuel droplets were supported with glass fiber. The soot characteristics are greatly influenced by diffusion. In this study the properties which constitutes the diffusion are analyzed experimentally. The results of synchronized schlieren and laser extinction setup collectively shows that the fuel soot thickness increases with the increment of the viscous forces of fuel. The hot boundary distance and soot thickness value collectively concludes that the fuel diffusion and air diffusion dominance is the biggest factor in soot production. Soot is minimized at a critical hot boundary distance at which air and fuel diffusion are stable, similar to that under an optimized stoichiometry. The results also reveal that Stefan flow area depends on the viscous and buoyant forces. The Richardson number results indicate that natural convection is affected by the microexplosion and changes from natural to mixed convection as water is added to the fuels.

Keywords: Schlieren imaging; Laser extinction imaging; Diffusion; Natural convection; Stefan flow (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034077

DOI: 10.1016/j.energy.2022.126521

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