蒸发冷凝法亚微米气溶胶发生装置的最佳运行参数

Optimum operating parameters of an evaporation-condensation submicron aerosol generator

理清蒸发冷凝法亚微米气溶胶发生装置中不同参数对气溶胶发生效果的影响,有利于提高气溶胶的单分散性。搭建了发生实验装置,通过调节各个参数,研究了参数对气溶胶发生效果的影响以及参数之间的相互影响,并与理论分析进行对比。研究表明:凝结核浓度足够高时,在保证调节后的气溶胶满足准单分散的前提下,若调节前的气溶胶几何标准偏差小于1.45,可通过提高饱和器体积流量来提高气溶胶计数中值直径,当几何标准偏差大于1.45时应通过提高再热温度来提高计数中值直径。

The operating parameters of an evaporation-condensation submicron aerosol generator affect the aerosol characteristics. These effects need to be understood to improve the aerosol monodispersion characteristics. Experiments on an aerosol generator, with various parameters show how each parameter affects the aerosol characteristics and how several parameters together achieve an integrated effect. Comparison of the results with theoretical analyses show that for a high nuclei concentration, while the final geometric standard deviation （GSD） is controlled to he quasi-monodispersed, the count median diameter （CMD） can be improved by increasing the saturator flow when the initial GSD 〈 1.45 or increasing the reheater temperature when the initial GSD ≥ 1.45.