采用GMM方法分析聚集粒子的辐射特性

采用广义多粒子M ie理论(GMM)研究了由球形微粒组成的聚集粒子的衰减因子、散射因子、散射相函数等辐射特性参数,考虑单元粒子之间的相互作用,与M ie理论计算的辐射特性参数(不考虑单元粒子之间的相互作用)进行分析比较.结果表明:考虑相互作用与不考虑相互作用所得的聚集粒子辐射特性存在着差异,这种差异随着粒子间的距离、尺度参数的变化而改变,并且具有一定的规律.同时,分析了聚集粒子与等效(等体积或等面积)单粒子之间的辐射特性差异对辐射传输计算的影响,研究发现:考虑相互作用的聚集粒子组成的粒子系与等效球粒子系的温度场之间有明显的差异,相对偏差的最大值约20%,因此,在计算聚集粒子组成的粒子系的温度场时不能忽略粒子间的相互作用.

Analysis of radiative properties of aggregated particles by generalized multi-particle Mie-solution method

The radiative properties of aggregated particles,such as the extinction efficiency factor,scattering efficiency factor and phase function,are studied using generalized multi-particle Mie-solution(GMM) method.Compared with the radiative properties of spheres calculated by Mie theory without considering the interactions among element particles,it shows that there exist many discrepancies,which change with the distance between particles and the size parameter,when considering the interactions among element particles.Furthermore,compared with the equivalent(area or volume) sphere,the influence of aggregated particles on the radiative transfer is analyzed.It shows that there exist obvious differences in temperature field with or without the consideration of interactions among particles in aggregated particles,and the maximum relative error is about 20%.Therefore,the interactions among particles in aggregated particles should not be ignored when calculating the temperature distribution of the media filled with aggregated particles.