The vaporizing behavior of the fuel droplet of water-in-oil emulsions on the hot surface
Abstract
Experiments were carried out to investigate qualitatively the effects of the emulsion internal phase structure, such as the size distribution of water droplets, on the microexplosion phenomena of water-in-'A'-heavy-oil emulsified droplets vaporizing on a hot surface. The results confirm that the size distribution of water droplets in the emulsified fuels plays a very important role in the boilng phenomena, in spite of the same water content included in the fuels. That is, emulsified fuel 1 with fine- and uniform-size distribution of the internal water droplets has a longer life time than the neat fuel ('A' heavy oil) due to a distinctive feature such as 'two stage vaporization'. In contrast, emulsified fuel 2 with coarse droplets has a life time less than a half of the neat fuel in the film boiling region. High-speed motion analyses revealed that such a remarkable promotion effect of vaporization was caused by the destruction of the vapor film due to the 'violent microexplosion' of coarse-coalescent water droplets.
- Publication:
-
JSME International Journal Series B
- Pub Date:
- December 1986
- Bibcode:
- 1986JSMEB..29.4247K
- Keywords:
-
- Drops (Liquids);
- Flow Visualization;
- Fuel Combustion;
- Fuel Flow;
- Vaporizing;
- Drop Size;
- Emulsions;
- Explosions;
- Particle Size Distribution;
- Photographic Recording;
- Water;
- Fluid Mechanics and Heat Transfer