Monte Carlo Simulation of Photophoresis of Submicron Aerosol Particles
Monte Carlo Simulation of Photophoresis of Submicron Aerosol Particles
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亚微米气溶胶颗粒光泳的蒙特卡罗模拟
DOI：
10.1175/1520-0469(1984)041
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发表时间：
1984
影响因子：
3.1
通讯作者：
M. Kerker
中科院分区：
文献类型：
--
作者：
M. Sitarski;M. Kerker
摘要本文提出了一种新的计算球形颗粒表面包覆挥发性同心球壳的电泳力的方法。粒子内热源的分布是由亚丁和克尔的同心球电磁模型的扩展得到的。球体内的热传导计算采用蒙特卡罗技术。在“自由分子”状态下获得了粒子表面的动量和能量输运。计算主要是针对美国东部烟霾的成核模式（半径为0.022微米）和积聚模式（半径为0.16微米）的粒子，其条件相当于高层大气。电泳力通常比重力大得多，在某些情况下，它是负的。事实上，负电泳的烟雾，沙漠灰尘和煤烟覆盖着肮脏的冰可能解释悬浮的这些粒子，随后在大气中的传输超过…
Abstract New calculations of the photophoretic force are presented for a spherical particle that may be coated with a volatile concentric spherical shell. The distribution of heat sources within the particle was obtained from an extension of the electromagnetic model of a concentric sphere of Aden and Kerker. The calculation for heat conduction within the sphere utilized a Monte Carlo technique. The nun momentum and energy transport at the particle surface was obtained in the “free molecule” regime. Computations were carried out mainly for particles at the nucleation mode (0.022 μm radius) and the accumulation mode (0.16 μm radius) of Eastern United States haze for conditions corresponding to the upper atmosphere. The photophoretic force was frequently much greater than the gravitational force and, in some cases, it was negative. Indeed, negative photophoresis for smoke, desert dust and soot coated with dirty ice might account for levitation of such particles with subsequent transport in the atmosphere ov...