In this work a cellulose fibrous (HEPA) filter and a polyester filter have been used to retain nanometre NaCI particles generated from a particle generator. The efficiency of these filters was obtained by counting particles before and after a filter sample using a particle counter. The collection mechanism that predominated was diffusion as particles were very small in size. For both filters, existing correlations from the literature indicated different values of efficiency compared to the experimentally determined values. The tests were carried out at superficial gas velocities between 2.0 and 12.8 cm/s. The results showed that efficiency decreased with increasing particle size, reinforcing the predominance of a diffusional mechanism over the range studied. The filter efficiency also decreased with filtration velocity.
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机译：在这项工作中，已使用纤维素纤维（HEPA）过滤器和聚酯过滤器来保留由颗粒发生器产生的纳米NaCl颗粒。这些过滤器的效率是通过使用颗粒计数器对过滤器样品之前和之后的颗粒进行计数而获得的。主要的收集机制是扩散，因为颗粒的尺寸非常小。对于这两个滤波器，文献中现有的相关性表明与实验确定的值相比，效率值不同。测试是在2.0至12.8 cm / s的表观气体速度下进行的。结果表明，效率随着粒径的增加而降低，从而在研究范围内增强了扩散机理的优势。过滤效率也随着过滤速度而降低。
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