Changes in the composition during vaporization of oil and water emulsion fuel droplets levitated on a hot surface by the Leidenfrost phenomenon have been studied experimentally. Results show that there exists a strong mechanism of transporting microdroplets to the vaporizing droplet surface such that the component consisting of the microdroplets always vaporizes first. This phenomenon indicates that such effects as the differences in the boiling points and densities or phase equilibrium characteristics of the two constituents of emulsion fuels are secondary. Thus, the dynamic evaporation characteristics of microdroplets should be accounted for in predicting the occurrence of microexplosions in addition to considerations for the thermodynamic criteria of microexlosions such as the limit of superheat.
Bibliographical noteFunding Information:
This work has been supported by the Korea Sc~ ence and Engineering Foundation. We are grateft to one of the referees for his patient assistance witl English of this manuscript.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes