外文文献和翻译---在多元液体气化中改变液相大规模扩散的暂时性影响.doc

南京工业大学 《化学工程与工艺》专业 本科毕业论文(设计) 外文资料翻译 原文名称 Effects of temporally varying liquid-phase mass diffusivity in multicomponent droplet gasification 原文作者 Huiqiang Zhang, Chung K. Law 原文出版 Combustion an Flame 翻译内容页码 全文 中文名称 在多元液体气化中改变液相大规模扩散的 暂时性影响 学生姓名唐柯楠 专业 化学工程与工艺 班级学号040126 指导教师（签字） 对译文的评价 技术学院 2008年 6 月 Effects of temporally varying liquid-phase mass diffusivity in multicomponent droplet gasification Abstract The relative roles of liquid-phase diffusional resistance and volatility differential in multicomponent droplet gasification are revisited, recognizing that liquid-phase mass diffusivities can be substantially increased as the droplet is progressively heated upon initiation of gasification, leading to a corresponding substantial weakening of the diffusional resistance. Calculations performed using realistic and temperature-dependent thermal and mass diffusivities indeed substantiate this influence. In particular, the calculated results agree with the literature experimental data, indicating that the gasification mechanism of multicomponent fuels is intermediate between diffusion and distillation limits. Investigation was also performed on gasification at elevated pressures, recognizing that the liquid boiling point and hence the attainable droplet temperature would increase with increasing pressure, causing further weakening of the liquid-phase diffusional resistance. This possibility was again verified through calculated results, suggesting further departure from diffusion limit toward distillation limit behavior for gasification at high pressures. The study also found that diffusional resistance is stronger for the lighter, gasoline-like fuels as compared to the heavier, diesel-like fuels because the former have overall lower boiling points, lower attainable droplet temperatures, and hence lower mass diffusivities in spite