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采用Monte-Carlo方法,对气溶胶凝聚粒子进行了模拟,讨论了凝聚粒子的孔隙特性,分析了空间结构、原始粒子数目对凝聚粒子孔隙率和等效折射率的影响。结合物质的电结构,将气溶胶凝聚粒子离散为一系列偶极子,利用离散偶极子近似方法,数值计算了不同孔隙率气溶胶凝聚粒子的散射、吸收和消光截面各种取向的统计平均值。结果表明,气溶胶凝聚粒子的孔隙率明显取决于其空间形状和所含原始微粒的数目;气溶胶凝聚粒子的等效折射率、吸收、散射和消光截面则随孔隙率的增加而减小。研究结果可为全面理解气溶胶粒子光学特性提供参考;也可为某些涂层材料光学性能的改变提供参考,通过改变涂层材料中凝聚粒子的孔隙率来改变涂层材料的等效折射率,进而改变涂层材料对光的散射和吸收。
The aerosol agglomeration particles were simulated by Monte-Carlo method. The pore characteristics of the agglomerated particles were discussed. The influence of the spatial structure and the number of primary particles on the porosity and the equivalent refractive index of the agglomerated particles were analyzed. According to the electrical structure of the material, the aerosol agglomeration particles are dispersed into a series of dipoles. The statistical average of various orientations of the scattering, absorption and extinction cross sections of aerosol agglomerated particles with different porosity is numerically calculated by the discrete dipole approximation value. The results show that the porosity of aerosol agglomeration particles obviously depends on their spatial shape and the number of primary particles. The equivalent refractive index, absorption, scattering and extinction cross sections of aerosol agglomeration particles decrease with the increase of porosity. The results can provide a reference for the comprehensive understanding of the optical properties of aerosol particles. It can also provide reference for the change of optical properties of some coating materials. The equivalent refractive index of the coating materials can be changed by changing the porosity of the agglomerated particles in the coating material , Which in turn changes the scattering and absorption of light by the coating material.