入口速度对静电monolith过滤器通道过滤性能的影响

采用单通道理论模型分析了表面带有静电的monolith过滤器通道的过滤性能。重点研究了气流入口速度大小和方向对通道捕获效率的影响,为设计和制造高效率低能耗的monolith过滤器提供理论指导。结果表明:对于直径1 μm以下粒子气流入口速度大小u0的增加会降低通道的捕获效率,当u0>3 m/s时,通道的捕获效率接近于零,对于直径1 μm以上粒子随着气流入口速度u0的增加,通道的捕获效率先减小后增大,出现一个极小值;在保证过滤器流量下,气流入口角度的增大会增加通道对直径1 μm以上粒子的捕获效率,而对直径1 μm以下粒子的捕获效率几乎没有影响。

Effect of inlet velocity on filtration capability of electrostatically charged monolith filter

A single-channel model was used to analyze the filtration capability of the electrostatically charged channel of a monolith filter.The aim of this study was to examine the effect of the inlet velocity magnitude and angle on a channel's capture efficiency.Results showed that an increase in inlet velocity magnitude (u0) would reduce a channel's capture efficiency when the diameter of a particle was less than 1.0 μm and the capture efficiency would approach 0 when u0 was above 3 m/s.The capture efficiency would first decrease and then increase as u0 increased when the diameter of a particle was larger than 1.0 μm, showing a minimum value.With a certain flow rate of the aerosols, an inlet velocity angle would improve the channel's capture efficiency when the diameter of a particle was larger than 1.0 μm, while it would show no significant difference when the diameter of a particle was smaller than 1.0 μm.