THE EFFECT OF PARTICLE CHARGE ON PENETRATION IN AN ELECTRET FILTER
THE EFFECT OF PARTICLE CHARGE ON PENETRATION IN AN ELECTRET FILTER
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DOI：
10.1109/28.6128
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发表时间：
1988-07-01
影响因子：
4.4
通讯作者：
OWENS, TM
中科院分区：
文献类型：
--
作者：
FJELD, RA;OWENS, TM
通过实验确定了驻极体过滤介质中直径为0.5微米的颗粒的收集机理，并确定了颗粒电荷对渗透的影响。将高度单分散的聚苯乙烯颗粒带电到不同的水平，并用光学粒子计数器测量了它们通过带电和放电驻极体滤光片的渗透率。颗粒通过带电过滤器的渗透率明显低于通过放电过滤器的渗透率。此外，在带电过滤器中，随着粒子电荷的增加，渗透率大幅下降，而在放电过滤器中，渗透率的下降幅度要小得多。根据这些结果，得出结论：在带电粒子的收集过程中，电泳法起主导作用，介电泳法仅在极低电荷水平时起重要作用，而机械收集过程相对不重要。实验数据与R.C.Brown(1981)的理论侵彻预测进行了比较。虽然实测值明显高于理论计算值，但数据显示系统地依赖于理论预测的单个无量纲参数。
Experiments were performed to identify collection mechanisms for 0.5 mu m diameter particles in electret filter media and to determine the effect of particle charge on penetration. Highly monodisperse polystyrene particles were charged to various levels, and their penetration through charged to various levels, and their penetration through charged and discharged electret filters was measured with an optical particle counter. Particle penetration through charged filters was significantly lower than through discharged filters. Also, in charged filters large decreases in penetration were observed with increasing particle charge, while in discharged filters much smaller decreases occurred. Based on these results it is concluded that electrophoresis played a dominant role in the collection of charged particles, dielectrophoresis was important only at very low charge levels, and mechanical collection processes were relatively unimportant. The experimental data were compared to theoretical penetration predictions of R.C. Brown (1981). Although measured values of penetration were found to be significantly higher than those calculated from theory, the data show a systematic dependence on a single dimensionless parameter that is predicted by theory.<>