The gasification mechanisms and sooting characteristics of freely-falling droplets of alcohol/oil blends and water/oil emulsions were experimentally studied by using microphotography to time-resolve the droplet gasification rate and phase-discriminating sampling to determine the instantaneous droplet composition and the gas-phase soot level. Results on the gasification studies show that while liquid-phase diffusional resistance is only moderately effective for a miscible mixture, it is sufficiently strong for water/oil emulsions such that the droplet composition remains basically frozen during combustion. Results on soot studies demonstrate that the primary causes for soot reduction with alcohol blending or water emulsification are the dilution of the fuel composition by non-sooty components and the reduction of the flame temperature because of reduced heats of combustion. The results do not seem to suggest any significant catalytic/oxidative effects of the hydroxyl radicals from the fuel mixtures.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes