不可溶性固态内核霾滴的散射及吸收特性分析

Analysis of Absorption and Scattering Properties of Water Host Haze Droplet with Insoluble Solid Inclusion

为研究大气环境不可溶性固态内核霾滴的光学性质,以纤维素、石英、聚苯乙烯、赤铁矿及碳黑5种典型凝结核为例,采用核-壳模型计算含不同种类内核霾滴的散射、吸收、消光等效率因子,重点讨论非吸收性内核、弱吸收性内核、强吸收性内核以及霾滴尺度等参数变化对霾滴光学特性的影响。研究结果表明,与吸收性内核霾滴相比,非吸收性内核霾滴的散射较强,PM2.5霾滴的散射与霾滴尺度参数y、内核尺度参数x以及内核复折射率m1等非线性相关;霾滴的吸收效率因子主要取决于内核相对尺度β与内核复折射率。研究结果有助于进一步开展大气雾霾能见度精确评估以及高湿环境多相流复杂介质的激光测量等研究。

The effect of a insoluble solid inclusion on optical property of a haze droplet is investigated. The efficiencies such as scattering, absorption, and extinction of a haze droplet with five nuclei including cellulose,quartz, polystyrene, hematite, and soot are calculated by using a core- shell model, respectively. Besides the haze size, the parameters including size of non- absorbent nucleus, weak- absorbent one, strong- absorbent core are discussed. The results showed that scattering of a PM2.5haze droplet with a non-absorbent nucleus is stronger than that with an absorbent one. The scattering of a PM2.5haze droplet is nonlinearly dependent on its size parameter y, the nucleus size x, and the complex refractive index m1. Absorption of the droplet is determined by its relative diameter β and m1. The above results may give guidance for further study on accurate assessment of haze visibility and laser diagnostics of multiphase flow complex medium in high humidity environment.