CAJ | 학술논문

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武,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.
기우Mie산사이론,재이유적단미립소광효솔인자(EEF)적기출상,건립료유불동척촌、불동절사솔미립외혼합적다미립계EEF적계산방법,병취기특정진행료분석.계산표명:외혼합미립적EEF수립도변화총시선쾌속증가,연후정체감소병추향우정치;수착분포관도혹절사솔허부적증가,소광곡선적진탕축보감약직지소실,저양EEF장경역학정,이수착절사솔실부적증가,기겁대치위치혹진탕특정향착립도감소적방향이동.연구표명,대강흡수혹관분포적미립급기혼합체,소광곡선불회진탕,차재립도체도일정치후,곡선궤호중합병수립도완만하강이최종추우정치.대차,제출료일충간단이실용적근사무,해식여이론치적평균화최대상대오차분별불초과1.0%화2.0%,설명료해근사공식적준학성.유우재실제공정급응용중,왕왕면대적시외혼합적다미립계,인차본연구구유교강적실제지도개치.
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 differ-ent 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 extinc-tion curves become weaker until disappear that helps to determine EEF. Extinction curves do not os-cillate 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 maxi-mum 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.