Investigation of the figure of merit for filters with a single nanofiber layer on a substrate
Investigation of the figure of merit for filters with a single nanofiber layer on a substrate
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DOI：
10.1016/j.jaerosci.2007.12.003
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发表时间：
2008-04-01
影响因子：
4.5
通讯作者：
Pui, David Y. H.
中科院分区：
文献类型：
--
作者：
Wang, Jing;Kim, Seong Chan;Pui, David Y. H.
我们研究了在微米纤维衬底上由一层纳米纤维组成的过滤器，并将这种纳米纤维介质的性能与传统的微米纤维过滤器进行了比较。通过表征过滤效率与压降之比的优值系数来评价纳米纤维过滤器的性能。对四个具有不同纳米纤维凝固度的样品进行了过滤试验。随着纳米纤维稠度的增加，过滤效率和压降均增大。我们开发了一个数值模型来模拟纳米纤维滤光片。当适当调整纳米纤维的稠度时，由模型计算的压降与实验结果吻合较好。由该模型可以计算纳米纤维由于截留、惯性撞击和扩散而产生的过滤效率。对于20~780 nm的颗粒，模拟结果与实验结果吻合较好，但对于小于20 nm的颗粒，模拟结果与实验结果有较大差异。我们的结果表明，与传统的玻璃纤维滤光片相比，纳米纤维滤光片对大于100 nm的颗粒具有更好的品质因数。对于小于100 nm的颗粒，纳米纤维过滤器的性能并不比传统的玻璃纤维过滤器好。(C)2007爱思唯尔有限公司。保留所有权利。
We investigate filters composed of a layer of nanofibers on a substrate made of micrometer fibers and compare the performance of such nanofiber media to conventional micrometer fibrous filters. The performance of the nanofiber filters is evaluated using the figure of merit, which represents the ratio between the filtration efficiency and the pressure drop. Filtration tests were performed on four samples with different nanofiber solidities. As the nanofiber solidity increases, the filtration efficiency and the pressure drop both increase. We develop a numerical model to simulate the nanofiber filters. When the nanofiber solidity is appropriately adjusted, the pressure drop computed from the model is in good agreement with experimental results. Filtration efficiency for the nanofibers due to interception, inertial impaction and diffusion can be computed from the model. The simulation results are in good agreement with experiments for 20-780 nm particles but discrepancies exist for particles smaller than 20 nm. Our results show that nanofiber filters have better figure of merit for particles larger than about 100 nm compared to conventional fiberglass filters. For particles smaller than 100 nm, nanofiber filters do not perfonn better than conventional fiberglass filters. (C) 2007 Elsevier Ltd. All rights reserved.