Studies on Combustion Nuclei

由于亚微米颗粒物对大气污染、气象现象、工业和生物洁净室的高洁净度等有很大影响，研究其在大气中的浓度和粒径分布具有重要意义。粒径分布的变化被认为是由凝聚、沉降、扩散等运动学现象引起的，本研究对城市空气中的亚微米颗粒物进行了连续测量，并对燃烧产生的亚微米颗粒物进行了测量。本文介绍了用三种计数器连续测量城市空气中亚微米颗粒物的方法。讨论了峰的大小和粒度分布的变化。结果表明，凝聚是改变颗粒粒度分布的有效运动学现象之一。此外，在实验室中进行的测量燃烧产生的亚微米颗粒，并在凝聚方面的结果进行了描述。其粒径分布的变化特征与大气中亚微米颗粒物相似。

It is important to study the concentration and size distribution of submicron particles in the atmosphere because of their great influence on air pollution, meteorological phenomena, high purity of industrial and biological clean rooms, etc. The atmospheric particles vary widely in composition and size. The change of size distribution is considered to be caused by coagulation, settling, diffusion and other kinematic phenomena.In this study, continuous measurements of submicron particles in urban air and measurements of submicron particles generated by combustion are conducted. This study presents continuous measurements of submicron particles in urban air by using three type counters. The peak size and the changes of size distribution are discussed. The results show that coagulation is one of the effective kinematic phenomena for the change of size distribution. Furthermore, measurements of submicron particles generated by combustion are conducted in an experimental chamber and the results are described in terms of coagulation. The changing characteristics of size distribution are similar to that of submicron particles in atmosphere.