亚微米燃烧源颗粒物间的相互作用研究  

THE INTERACTIONS BETWEEN SUBMICRON COMBUSTION PARTICLES

作　　者：赵海亮[1] 由长福[1] 黄斌[1] 祁海鹰[1] 徐旭常[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2006年第6期1063-1065,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究973规划项目(No.2002CB211604)

摘　　要：采用微观可视化的高速摄像技术直接观察了燃烧源亚微米颗粒物间的相互作用形态,发现了亚微米颗粒间存在“吸引-旋绕-排斥”形态的相互作用。通过颗粒受力分析,认为传统所考虑的曳力、重力、库仑力、范德华力不能解释这种相互作用．根据亚微米颗粒荷电的不均匀性特征提出颗粒静电力应包括净电荷库仑力和感应偶极子间作用力两部分．感应偶极子间作用力是近程力,具有径向和周向两个方向,在颗粒比较接近的时候迅速增大,并能导致颗粒之间相互旋绕和排斥。该力与上述几种力综合起来可以很好地解释实验发现的这种颗粒相互作用形态。The microscopic interactions between submicron combustion particles were observed by high-speed photographing technology and the typical interaction mode of ＂attracting-revolvingrepulsing＂ was found. Force analyses showed that the traditionally considered drag force, gravity, Coulomb and van der Waals forces can not explain this phenomenon. Based on the electrostatic properties of submicron particles, it was pointed that the electrostatic forces between particles include the forces between induced dipoles as well as Coulomb forces between net charges. The inter-dipole forces have components in the radial and tangent directions and can cause revolving and repulsing. The combined results of these forces can give a good explanation for the interactive phenomenon.

关 键 词：亚微米颗粒 颗粒间相互作用 颗粒受力 静电力 偶极子力 

分 类 号：O359[理学—流体力学]