2008 Volume 34 Issue 1 Pages 161-167
Secondary atomization in emulsified fuel is widely accepted to explain a decrease in NOx, CO and soot emissions. Although secondary atomization of emulsified fuel droplets is known to be stochastic, little detailed information is available on this behavior. In this paper, the effect of emulsified fuel droplet temperature and initial diameter on secondary atomization was investigated. The purpose of this study was to reveal the occurrence conditions of vapor outbreak (puffing), which is a form of secondary atomization. A water/n-dodecane emulsified fuel droplet suspended from a thermocouple was set into an electric furnace, and secondary atomization of the droplet was observed by using a hi-speed camera. The effects of the initial diameter of the water/n-dodecane emulsified fuel droplet and wall temperature of the furnace were also investigated. As a result, the probability of puffing increased with an increase in furnace wall temperature and the initial diameter of the emulsified fuel droplet.
