三组元W/O乳化液的表面张力和雾化特性

Study of Surface Tension and Atomization of W/O Emulsions

研究了W/O型乳化液的表面张力,压力雾化喷嘴的乳化液雾化特性与乳化液的组分、乳化剂的黏度以及喷油压力的关系.实验结果表明:乳化液的表面张力接近柴油,但喷雾滴径均大于柴油,而且喷嘴的启喷压力、乳化液组分和乳化剂黏度对乳化液平均滴径均有显著影响.随着启喷压力升高,喷雾滴径明显减小;若启喷压力相同,随着乳化液中水相含量增加(不高于50%),乳化液喷雾滴径随之增加;采用高黏度、低HLB值乳化剂配制的乳化液的喷雾滴径相对较大;内相界面特性和界面上的乳化剂会对滴径分布有重要影响.

This paper studies the surface tension of water/methanol-diesel fuel W/O emulsions, and the relationship between the atomization characteristics of pressurized nozzle and the contents, viscosity of the emulsions with different injection pressures. The experimental results show that the surface tension and viscosity of the emulsions are close to those of the diesel fuel, but the Sauter mean diameter (SMD) of emulsion droplets is larger than that of diesel droplets, and the injection pressure, the content and the viscosity of the emulsions have significant effects on the SMD of the emulsion droplets. For emulsions, when the injection pressure increases, the SMD decreases very much; and the SMD increases when the aqueous phase (water and/or methanol) fraction increases (not more than 50%), if the injection pressure is constant. When a small amount of viscous emulsifying agent with a lower HLB (Hydrophilic-Lipophilic Balance) was employed, the SMD of emulsion is much larger. This suggests that, the interfacial condition and the agents between dispersed phase and continuous phase have a very important influence on SMD.