Homogeneous nucleation and bubble evolution inside a fuel droplet trigger the occurrence of flash boiling, which shows a high potential to improve the droplet evaporation. To understand the bubble dynamic characteristics, an analytical study on homogeneous nucleation and bubble evolution has been performed, based on the flash boiling model proposed in our work. First, the nucleation rate graph of seven fuels within a wide range of operating temperatures is obtained according to the homogeneous nucleation model. Then the variation of homogeneous nucleation characteristics with fuel temperature and ambient pressure is discussed. Finally, the bubble evolution and boiling explosion of a single droplet are studied for different fuels at 490 K, 530 K, and 560 K, respectively. The results show that the nucleation characteristics are mainly affected by the fuel physical properties, especially the boiling point and surface tension. Moreover, the transitional and heat transfer controlled stages during bubble evolution are significantly affected by the nucleation rate, which causes temperature change and affects the boiling explosion time.
Analytical Study on Homogeneous Nucleation and Bubble Evolution Inside Monocomponent Fuel Droplet
Journal of Thermophysics and Heat Transfer ; 35 , 3 ; 560-568
2021-01-18
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Homogeneous Nucleation in Condensation
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