液滴变形对荷电水雾吸附细颗粒物影响

摘要

The effect of charged droplet deformation on the adsorption characteristics of dust particles was investigated.By simpli-fying the motion equation of fine particles in three-dimensional space,several main non-dimensional parameters which impact par-ticles’motion were acquired:Stokes number and Coulomb number.A numerical model for the motion of dust particles in vicinity of a deformed charged droplet was proposed,where the effect of droplet deformation on electric field was considered.Dust re-moval process was described by tracking the trajectory of fine particles in three-dimensional space.Results show that increasing of Stokes number enhances the inertial impaction deposition and Coulomb number enhances the electrostatic deposition.When the major axis of elliptic droplet and the airflow direction are parallel to each other,inertial impaction deposition is weakened and elec-trostatic deposition is promoted.As the major axis of deformed droplet is perpendicular to the airflow direction,the results are completely opposite to the parallel condition.For larger droplet deformation rate,the influence of deformation on dust particles collection is stronger.%为研究液滴变形对荷电水雾吸附细颗粒物的影响，通过对三维空间中液滴周围细颗粒物的运动方程量纲为1化，获得影响细颗粒物运动的主要参数———斯托克斯数（Stk）和库仑数（Kc），在考虑液滴变形对电场影响的基础上，建立了静电力和气动力共同作用下不同变形状态的荷电液滴周围细颗粒物运动的数值模型，通过追踪三维空间中细颗粒物的运动轨迹来描述荷电单液滴的除尘过程。结果表明：Stk 的增大能促进惯性碰撞沉积，而 Kc 的增大能促进静电沉积；液滴变形为长椭球且它的长轴与气流运动方向平行时，会削弱惯性碰撞沉积，但对静电沉积有一定促进作用，而长轴与气流运动方向垂直时，情况则完全相反；液滴变形率越大，不同角度下液滴变形对沉积的影响作用越强。