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Removal of Elongated Particle Aggregates on Fibrous Filters

机译：去除纤维过滤器上的细长颗粒聚集体

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Elongated aerosol particle removal on fibrous filters has been investigated. It was shown that particle agglomerates are removed much more efficiently compared to the regularly shaped single particles with identical electrical mobility diameter at two filtration velocities tested. The experimental results were compared with the classical filtration theory and it was shown that the theoretical predictions, which are based on the assumption that the particles are spherical, are significantly different compared to an agglomerate filtration efficiency value. In order to account for a particle shape non-regularity, dominating nanoparticle removal mechanisms were firstly evaluated for a regular particle of certain size and then adjusted by fitting coefficients k_1 (for diffusion component) and k_2 (for interception). These coefficients were determined by fitting the theoretical values that gives the best coincidence with the measured data points. As was further demonstrated theoretically, the coefficient ki is identical to the ratio of the actual particle surface area to the surface area of the spherical particle of the equivalent diameter. On the other hand, the coefficient k_2 was found to be equal to the ratio of the projection of a given particle on a plane perpendicular to a streamline, to that of the spherical particle of the equivalent diameter. The reported findings would allow undertaking more accurate evaluation of the removal efficiency of non-regular aerosol particle, which is especially important for industrial applications where non-regular aerosols are frequently met.
机译：已经研究了在纤维过滤器上去除细长气溶胶颗粒的方法。结果表明，与在两个测试过滤速度下具有相同电迁移率直径的规则形状的单个颗粒相比，颗粒团块的去除效率更高。将实验结果与经典过滤理论进行了比较，结果表明，基于颗粒为球形的假设的理论预测与团聚过滤效率值相比有显着差异。为了解决颗粒形状的不规则性，首先对一定尺寸的规则颗粒评估主要的纳米颗粒去除机理，然后通过拟合系数k_1（对于扩散成分）和k_2（对于拦截）进行调整。这些系数是通过拟合理论值确定的，该理论值与测量的数据点具有最佳的一致性。从理论上进一步证明，系数ki等于实际颗粒表面积与当量直径的球形颗粒表面积之比。另一方面，发现系数k_2等于给定颗粒在垂直于流线的平面上的投影与等效直径的球形颗粒的投影之比。报告的发现将允许对不规则气溶胶颗粒的去除效率进行更准确的评估，这对于经常遇到不规则气溶胶的工业应用而言尤其重要。

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