高温壁面上におけるW/Oエマルション液滴の内部挙動および微粒化挙動に及ぼす界面活性剤濃度の影響

抄録

An experimental study has been performed by observing the internal and atomization behavior, and by measuring the droplet temperature during spheroid-type evaporation of water-in-oil (W/O) emulsion on a heated surface. The base fuel was n-dodecane. In this study, the effects of surfactant concentration were mainly examined. By decreasing the surfactant concentration from 0.8 to 0.2 % in volume, stability of the emulsion was reduced. When the surfactant concentration was decreased, number of puffing microexplosion much decreased. Aggregation and coalescence of dispersed water droplets were accelerated in the emulsion droplet, and the water volume contained in the fuel droplet increased. Occurrence frequency of disruptive microexplosion increased even at lower surface temperatures. Moreover, it became earlier at lower droplet temperatures.