双极凝聚中颗粒初始电荷的分布规律

Initial Charge Distribution of Particles in Bipolar Agglomeration

为确定双极凝聚计算中颗粒的初始电荷分布,采用FORTRAN程序,对双极凝聚涉及的电流体场进行求解,然后在荷电段跟踪大量的某一粒径颗粒,统计得到颗粒在荷电段出口(即凝聚段入口)处的电荷分布.计算结果表明,颗粒的初始电荷分布近似于对数正态分布函数,并且更高的应用电压、更低来流速度可以使颗粒所带的平均电荷数量越多.

To determine the particle initial charge distribution in calculating bipolar agglomeration,this article first solved the electrohydrodynamic flow in electrostatic agglomerator using FORTRAN code.Then,a mass of representative particles with a certain diameter was tracked in the charging zone,and the charge distribution was statistically obtained at the outlet of the charging zone（i.e.the inlet of the agglomerating zone）.The presented calculation shows that the particle initial charge distribution is similar to a lognormal function,and that the higher applied voltage and lower inlet velocity,the more particle average charge number.