Models for droplet transient heating: a comparative analysis

W.A. Abdelghaffar, Elena Sazhina, Sergei Sazhin, Morgan Heikal

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

Results of recent studies of the effect of the temperature gradient inside fuel droplets on droplet evaporation, break-up and the ignition of fuel vapour/air mixture are reviewed. This is investigated by comparing the 'effective thermal conductivity' and the 'infinite thermal conductivity' models, both of which have been implemented into a zero-dimensional code. The predictions of the code are validated against available experimental data. It is pointed out that in the absence of break-up, the influence of the temperature gradient inside droplets on droplet evaporation under realistic diesel engine conditions is generally small (a few percent). In the presence of the break-up process, however, the temperature gradient inside the droplets can lead to a significant decrease in evaporation time. This is attributed to the fact that the effect of the temperature gradient inside droplets leads to a substantial increase in droplet surface temperature at the initial stages of its heating. Even in the absence of break-up, the effect of the temperature gradient inside the droplets leads to a noticeable decrease in the total ignition delay. In the presence of break-up this effect is enhanced substantially, leading to more than halving of the total ignition delay.
Original languageEnglish
Title of host publication4th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2005)
Publication statusPublished - Sep 2005
Event4th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2005) - Cairo, Egypt
Duration: 1 Sep 2005 → …

Conference

Conference4th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2005)
Period1/09/05 → …

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    Abdelghaffar, W. A., Sazhina, E., Sazhin, S., & Heikal, M. (2005). Models for droplet transient heating: a comparative analysis. In 4th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2005)