双极荷电颗粒在外加交变电场中的静电凝聚  

Electrostatic coagulation of bipolar-charged particles in an external AC electric field

作　　者：谭百贺[1] 王连泽[1] 吴子牛[1] 

机构地区：[1]清华大学工程力学系,流体力学研究所,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第2期301-304,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10472057)

摘　　要：为了定量分析外加交变电场对双极荷电颗粒静电凝聚的影响,基于双极荷电颗粒在交变电场中的静电凝聚系数公式,利用数值计算的方法求解了荷电颗粒凝聚的数量平衡方程,得到了不同时刻颗粒数量浓度、颗粒带电量和颗粒粒径的关系曲线,比较了外电场存在与否时颗粒数量浓度的变化。结果表明:对于初始单弥散度带任意电荷量的颗粒,其数量浓度随凝聚时间单调减少;外加交变电场能够有效地促进双极荷电颗粒间的凝聚;颗粒上所带的电荷量越大,凝聚效果越明显。The effect of an AC electric field on the coagulation of charged particles was studied numerically by solving the coagulation equation for charged particles based on the coagulation coefficient for bipolar-charged particles in an AC electric field. The particle concentration in the external electric field was compared with those without any electric field. The results show that the coagulation rate of the bipolar-charged particles is increased significantly by the external AC electric field and the particle concentration decreases monotonically regardless of the particle charge. Particles with more charges more efficiently coagulate.

关 键 词：颗粒凝聚方程 荷电颗粒 凝聚系数 交变电场 

分 类 号：X513[环境科学与工程—环境工程]