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基于PIC-MCC法的颗粒物在等离子体中荷电仿真

发表时间:2014-02-15  浏览量:1532  下载量:618
全部作者: 钱中,杨帆
作者单位: 常州大学石油工程学院;上海理工大学能源与动力工程学院
摘 要: 颗粒物在低温等离子体中的荷电瞬间完成且过程复杂,所带电量的多少直接影响颗粒的运动与捕集。基于单元粒子(particle-in-cell, PIC)法和蒙特卡罗(Monte-Carlo collision, MCC)混合法,建立仿真模型,模拟颗粒物在低温Ar等离子体中的荷电特性。通过统计达到颗粒物表面的正、负带电粒子数目获得电荷量,并获得鞘层内电势和粒子分布。研究表明:半径为15 μm的颗粒在等离子体中荷电量约为-1.24×10-14 C,颗粒表面电势约为-7.56 V,且在距离表面100 μm范围内迅速升至0. 在颗粒表面鞘层内,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背景等离子体数密度,而电子数密度则相对较慢地增大至背景数密度。颗粒的荷电量与其粒径成正比。
关 键 词: 计算物理学;等离子体;颗粒物;荷电;单元粒子法;蒙特卡罗法
Title: Charging simulation of particulates in low temperature plasma based on PIC-MCC method
Author: QIAN Zhong, YANG Fan
Organization: School of Petroleum Engineering, Changzhou University; School of Energy and Power Engineering, University of Shanghai for Science and Technology
Abstract: Charging of particulates in low temperature plasma is instantaneously finished and the process is complicated. The motion and trapping of the particulates are directly determined by the charges of themselves. Here, a numerical model based on particle-in-cell(PIC) and Monte-Carlo collision (MCC) hybrid method was developed to study the charging characteristics of fine particles immersed in low temperature argon plasma. The net charge of a fine particulate was evaluated by counting the number charged particles reaching the surface of the particulate. Meanwhile, the profiles of electric potential and particle number density were obtained. For the particulate with a radius of 15 μm in the plasma, the charge is approximately -1.24×10-14 C and the electric potential of the surface is about -7.56 V. Also the potential quickly increased to 0 within 100 μm. In the sheath, the ion number density was always greater than that of the electron. Ion density quickly raised to the background plasma density, however, the electron density relatively slowly enlarged to the background value. The charge of a particulate tended to be proportional to its diameter.
Key words: computational physics; plasma; particulates; charging; particle-in-cell; Monte-Carlo collision
发表期数: 2014年2月第3期
引用格式: 钱中,杨帆. 基于PIC-MCC法的颗粒物在等离子体中荷电仿真[J]. 中国科技论文在线精品论文,2014,7(3):269-272.
 
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