Effect of air humidity on the evolution of permeability and performance of a fibrous filter during loading with hygroscopic and non-hygroscopic particles
Effect of air humidity on the evolution of permeability and performance of a fibrous filter during loading with hygroscopic and non-hygroscopic particles
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DOI：
10.1016/s0021-8502(03)00027-2
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发表时间：
2003-06-01
影响因子：
4.5
通讯作者：
Miguel, AF
中科院分区：
文献类型：
--
作者：
Miguel, AF
建立了一个模型来预测纤维过滤器在动态状态下的渗透性和性能（即渗透性与每单位表面捕获的气溶胶颗粒数的乘积）。除了气溶胶颗粒的质量载荷外，该模型还考虑了过滤器的结构特性、载荷颗粒的大小和过滤速度。为了获得所需的输入数据，对模型的一些相关参数进行综合估计并进行验证，进行了实验滤波研究。本研究采用氯化钠和氧化铝气溶胶，粒径范围分别为0.5 -1.3和0.8-6，过滤速度分别为2、5和15 cm/s。空气相对湿度控制在32 ~ 90%。结果表明，滤料的渗透性和性能不仅受到气溶胶颗粒大小和颗粒质量载荷的影响，还受到颗粒吸湿性和空气湿度的影响，这两个量与滤料颗粒密度之间存在相互关系。此外，除了在潮解点以上的湿度下过滤氯化钠颗粒外，该过滤器在高湿度下运行时效率更高。2003爱思唯尔科学有限公司版权所有。
A model was developed to predict the permeability and performance (i.e., the product of the permeability by the number of aerosol particles caught per unit surface) of a fibrous filter in dynamic regime. Besides the mass loading of the aerosol particles, this model took into account the structural characteristics of the filter, the size of the loading particles and the filtration velocity. An experimental filtration study was carried out to obtain the necessary input data for a comprehensive estimation of some relevant parameters of the model and to verify it. This study was performed with sodium chloride and alumina aerosols in the size range of 0.5 -1.3 mum and 0.8-6 mum, respectively, and filtration velocities of 2, 5 and 15 cm/s. The relative air humidity was controlled in the range of 32-90%.It was observed that the permeability and the performance of tested filter were not only influenced by the size of aerosol particle and mass loading of particles but also by the particle hygroscopicity and air humidity, through the interdependence of this quantities with cake particle density. Furthermore, the filter was found to be more efficient when it operated at high humidities, except for sodium chloride particles at humidities above the deliquescent point. (C) 2003 Elsevier Science Ltd. All rights reserved.