多分散气溶胶凝聚粒子散射特性的数值计算
Numerical calculation of scattering characteristics of polydisperse aerosol aggregates particles
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摘要:
基于簇团-簇团(Cluster-Cluster Aggregation,CCA)模型,结合气溶胶谱分布函数,模拟了多分散气溶胶凝聚粒子.利用离散偶极子近似方法,数值计算了多分散气溶胶凝聚粒子散射强度的角分布,对比分析了多分散和单分散气溶胶凝聚粒子散射特性的差别,并讨论了散射强度随入射波波长和入射角变化的规律.结果显示:多分散和单分散气溶胶凝聚粒子的散射特性截然不同,凝聚粒子中原始微粒的粒径、入射波长、入射波的入射角等因素都将影响气溶胶粒子的散射特性.多分散凝聚粒子模型更接近实际气溶胶粒子,结果可为全面理解和研究气溶胶粒子散射特性提供参考和有效的计算方法.
Abstract:Combine with the spectral distribution function of aerosol, cluster-cluster aggregation (CCA) model is used to simulate polydisperse aerosol aggregates particle. The angular distribution of scattering intensity of polydisperse aerosol aggregates particle is numerical calculated by using discrete dipole approximation method, and scattering characteristics difference between polydisperse and monodisperse aerosol aggregates particle are analyzed, and the variation law of scattering intensity changed with incident wavelength and angle are discussed too. The result shown that the scattering characteristics of polydisperse aerosol aggregates particle significantly different from monodisperse aerosol aggregates particle, and the particle size of original particles in aggregates particles, the incident wavelength and angle, etc. are all influenced the scattering characteristics of aerosol particles. The polydisperse aerosol aggregates particles model is much closer to real aerosol particles, the findings could provide reference and efficient calculation method for comprehensive understanding and researching on the scattering characteristics of aerosol particles.
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