低温等离子体中微细颗粒物荷电特性粒子模拟  

PARTICLE SIMULATION OF CHARGING CHARACTERISTIC OF FINE PARTICULATES IN LOW TEMPERATURE PLASMA

作　　者：钱中[1] 杨帆[2] 

机构地区：[1]常州大学石油工程学院,江苏常州213016 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《低温物理学报》2014年第3期227-231,共5页Low Temperature Physical Letters

基　　金：教育部博士点基金资助项目(批准号:20103120120003);江苏省高校自然科学研究项目(批准号:12KJB470001)资助的课题~~

摘　　要：针对微细颗粒物在低温氩等离子体中的荷电过程,基于单元粒子法和蒙特卡罗混合法,进行粒子模拟.通过统计到达颗粒表面的电子和离子数目,确定其净电荷量,并获得带电粒子空间分布与自洽电场.仿真表明:半径为5μm的颗粒在等离子体中荷电量约为27800e,颗粒表面电势约为-8V,且在距表面20μm范围内迅速衰减至0V.在颗粒附近,离子数密度始终大于电子数密度.离子数密度在近壁处迅速增至无扰动区数密度,而电子数密度则相对较慢地增大至背景浓度.此外,颗粒荷电量与粒径成正比.The charging characteristic of micro sized particulates in the low temperature argon plasma was studied via particle simulation based on Particle-in-Cell （PIC） and Monte Carlo （MC） hybrid method. The net charge of a fine particulate matter was determined by counting the number of electrons and ions reached the surface of the particulate. Meanwhile, the profiles of charged particles and self-consistent electric field were obtained. For the particle with a radius of 5 μm in the plasma, the charge is approximately 27800 e and the electric potential of the surface is about -8. 0 V. Also the potential quickly decay to 0 V within 20 μm. In the vicinity of the particle, the ion number density is always greater than that of the electron. Ion density quickly raised to the undisturbed zone density near the wall, however, the electron density relatively slowly increased to the background concentration. Furthermore, the charge quantity of a dust particle is proportional to its size.

关 键 词：微细颗粒物 等离子体 荷电 粒子模拟 

分 类 号：O53[理学—等离子体物理]