室内细颗粒物碰撞模型及碰撞结果讨论

The Collision Model for Indoor Fine Particles and the Collision Results

为了研究室内细颗粒物凝并机理,基于统计平均及颗粒物随机运动的思想对室内细颗粒物碰壁数和细颗粒物之间发生对心碰撞的概率进行了总结计算,并对碰撞之后的结果进行了定量和定性的分析,得到了0.3μm的DOP颗粒的最终压缩变形与碰撞发生初始速度以及碰撞效率随粒径变化曲线.颗粒物碰撞后凝并的可能性会随着颗粒碰撞初速度的增加而降低,小粒径颗粒发生碰撞后凝并的可能性一般会大于大粒径颗粒,碰撞效率随粒径的增大而减小.

In order to study the coagulation mechanism for indoor fine particles,the number of particles colliding with walls and the collision probability between particles were calculated based on the idea of statistical mean and random motion of particles. The collision results were also studied with the qualitative and quantitative analysis methods. The relationship between the final compressive deformation and the initial velocity,and that between the collision efficiency and the particle diameter,were obtained for 0.3 μm DOP particles. The results show that the coagulation possibility of particles decreases with the particle velocity,the finer particles are easier to coagulate after collision,and the collision efficiency increases with the particle diameter.