[1]戴兵,袁银男,罗向东,等.外混合微粒的消光效率因子的特征及一种简单近似[J].东南大学学报(自然科学版),2010,40(1):223-226.[doi:10.3969/j.issn.1001-0505.2010.01.042]
 Dai Bing,Yuan Yinnan,Luo Xiangdong,et al.Characteristic and a simple approximation of extinction efficiency factor for external mixture of particles[J].Journal of Southeast University (Natural Science Edition),2010,40(1):223-226.[doi:10.3969/j.issn.1001-0505.2010.01.042]
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外混合微粒的消光效率因子的特征及一种简单近似()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第1期
页码:
223-226
栏目:
电磁场与微波技术
出版日期:
2010-01-20

文章信息/Info

Title:
Characteristic and a simple approximation of extinction efficiency factor for external mixture of particles
作者:
戴兵1 袁银男1 罗向东1 卞保民2 贺安之2
1 南通大学理学院, 南通 226007; 2 南京理工大学理学院, 南京 210094
Author(s):
Dai Bing1 Yuan Yinnan1 Luo Xiangdong1 Bian Baomin2 He Anzhi2
1 School of Sciences, Nantong University, Nantong 226007,China
2 School of Sciences, Nanjing University of Science and Technology, Nanjing 210094, China
关键词:
微粒 消光效率因子 混合 近似
Keywords:
particle extinction efficiency factor mixing approximation
分类号:
TN011
DOI:
10.3969/j.issn.1001-0505.2010.01.042
摘要:
基于Mie散射理论,在已有的单微粒消光效率因子(EEF)的基础上,建立了由不同尺寸、不同折射率微粒外混合的多微粒系EEF的计算方法,并就其特征进行了分析.计算表明:外混合微粒的EEF随粒度变化总是先快速增加,然后整体减小并趋向于定值; 随着分布宽度或折射率虚部的增加,消光曲线的震荡逐步减弱直至消失,这样EEF将更易确定,而随着折射率实部的增加,其极大值位置或震荡特征向着粒度减小的方向移动.研究表明,对强吸收或宽分布的微粒及其混合体,消光曲线不会震荡,且在粒度达到一定值后,曲线几乎重合并随粒度缓慢下降而最终趋于定值.对此,提出了一种简单而实用的近似式,该式与理论值的平均和最大相对误差分别不超过1.0%和2.0%,说明了该近似公式的准确性.由于在实际工程及应用中,往往面对的是外混合的多微粒系,因此本研究具有较强的实际指导价值.
Abstract:
Based on Mie scattering theory and the past studying on extinction efficiency factor(EEF)for single particle, a calculation method of EEF for external mixture of particles with different sizes and refractive indices was established. The calculation shows that at first their EEF increase rapidly with the change of particle sizes, and then tend to a constant. With an increase of the width of PSD(particle size distribution)or the imaginary part of refractive index, the oscillation of extinction curves become weaker until disappear that helps to determine EEF. Extinction curves do not oscillate for particles and their mixture with strong absorptive or wide distribution. Especially, after particle size exceeds a certain value, their extinction curves are almost overlapped and fall slowly with particle size. Thus, a simple and practical approximation is presented. The average and maximum relative errors of the approximation do not exceed 1.0% and 2.0% respectively, compared with theoretical results,which explains its accuracy. Because practical particles are often external mixture of particles, this study is significant in practice.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 戴兵(1964—),男,硕士,教授,d.bing@ntu.edu.cn.
基金项目: 国家自然科学基金资助项目(50976051)、江苏省高等学校自然科学重大基础研究资助项目(08KJA510002).
引文格式: 戴兵,袁银男,罗向东,等:外混合微粒的消光效率因子的特征及一种简单近似[J].东南大学学报:自然科学版,2010,40(1):223-226. [doi:10.3969/j.issn.1001-0505.2010.01.042]
更新日期/Last Update: 2010-01-20