文章基本信息

标题：Numerical Investigation of Heterogeneous Nucleation of Supersaturated Water Vapour on Coal-fired PM 10
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作者：Ju Gao ; Ting-fang Yu ; Run-guo Chen 等
期刊名称：Nature, Environment and Pollution Technology
印刷版ISSN：0972-6268
出版年度：2020
卷号：19
期号：1
页码：295-302
语种：English
出版社：Technoscience Publications
摘要：The kinetic model is adopted to describe heterogeneous nucleation of supersaturated water vapour on coal-fired PM 10 . To verify the accuracy of the kinetic model, it is compared with the Fletcher model and experimental data. Additionally, the comparison for condensation and evaporation coefficients and the relative importance of two diffusion condensation mechanisms are systematically analysed during embryo growth process. Furthermore, the influence of vapour temperature on nucleation rate and critical supersaturation for coal-fired PM 10 are researched. The results show that the predicted critical supersaturation for Kinetic model is far closer to the experimental data compared with the Fletcher model. What is more, once the embryo radius rn reaches to the critical embryo radius r*, it can grow spontaneously, and the indirect surface diffusion mechanism is more important than the direct addition mechanism to embryo growth, the value of RTO is always above 100. It is also found that increase in the vapour temperature is conductive to nucleation process, which can increase the nucleation rate and decrease the barrier of nucleation free energy.
关键词：Heterogeneous nucleation;Coal-fired PM 10;Critical supersaturation;Nucleation rate