Investigation of the figure of merit for filters with a single nanofiber layer on a substrate

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作者：Jing Wang ; Seong Chan Kim ; David Y.H. Pui
关键词：Nanofiber filters ; Figure of merit
刊名：Journal of Aerosol Science
出版年：2008
期刊代码：45_00218502
类别：ce
出版时间：April 2008
卷：39
期：4
页码：323-334
文件大小：627 K

摘要

The model of gas flow inside the filter is based on the theory of complex variable for two dimensional Stokes flow past row of equal, parallel circular cylinders which corresponds to the single layer in our model at the filter structure.

Using the model of gas flow we are able to calculate the instantaneous field of gas velocity, u(x,t) inside the elementary cell in this layer and the instantaneous pressure drop.

Single collector efficiency of particle deposition was calculated for deterministic effects namely, interception, inertial impaction, sedimentation and electrostatic interaction between a particle and collector, as well as for Brownian motion of particle using multilayer filter structure, the filtration efficiency of the filter was determinated, as a function of filtration parameters.

Theoretical results were verified in experiment measurements. Fibres made at polyacryl, polypropylene and glass were used as filter material placed in the filter holders of rectangular shape. An electrostatic field was generated between two flat electrodes connected with high voltage DC supply. The efficiency of filtration and pressure drop was measured as a function of particle and fibre diameters, electrostatic properties of their material, configuration of external field, fibrous porosity and gas velocity. The examples of measurements is shown in Fig. 2.

The results of measurements are in a good qualitative agreement with the theory.

Figure omitted

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