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《Journal of Safety and Environment》 2003-05
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FU Hai-ming,SHEN Heng-gen ( College of Environment Science and Engineering, Donghua University, Shanghai 200051, China)  
This paper aims at studying the aerosol collection efficiency which mainly concerns the calculation of filtration and particles deposition across the filters. The main mechanisms of filtration include Brownian diffusion, interception and inertial impaction. Broadly speaking, the behavior of a filter over time can be divided into a two-phase : stationary filtration and a non- stationary one. It is assumed that changes in the filter structure duo to particles' deposition is sufficiently negligible so that the filter efficiency is unaffected for the stationary filtration phase. Meanwhile the particles in contact with a fiber are captured with no need to modify the filtration mechanisms. Therefore the collection efficiency and the pressure drop across the filter do not change with time for the stationary phase. With the increase of the filtration time, particles are gradually congregated at the fiber surface , which may lead to the non stationary filtration occur, and in turn the changes in filter structure as a result of particles' collision with new particles congregated on the earlier ones. The new particles congregated will form chainlike agglomerates known as dendrites, which tends to increase the power of the particles captured. And, consequently, with times changing, the particle deposition and dendrites will dramatically increase the collection efficiency of the fiber-dendrite system. But most of the works so far published are mainly concerned with the stationary filtration with few of them devoted to the non stationary one. Seeing the problem above mentioned, this paper has given an analysis to the research and development of aerosol filtration theories, thus proposing a model of calculating collection efficiency during the non-stationary filtration phase. Based on the study of the particles' deposition on the fiber surface in accordance with the laws of quality conservation, the author has presented a mathematics model for the non-stationary filtration process and deduced a calculation formula of collection efficiency with the non-stationary filtration in view of the calculation theories. Comparing the author's calculation result with the related experimental studies, it is claimed that this model can reflect th?change regulation of non-stationary filtration process more accurately and thus helps to explain the theoretical basis for predicting the filters' collection efficiency and prolonging the useful life of the porous filtration material concerned.
【CateGory Index】: X513
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【Secondary References】
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1 HAO Wen-ge1,SHI Wei2,DING Shu1,ZHU Na1(1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110004,China;2.Shenyang Northeastern University Institute of Metallurgical Technology Co.,Ltd.,Shenyang 110004,China);Mechanism and Design Method of a Dust Cleaning System:Rotary Blowback Bag Filter[J];Journal of Northeastern University(Natural Science);2009-10
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1 ZHANG Xiao-li (Zhuzhou Professional Technical College, Zhuzhou, Hunan 412000, China);A new integrable type of differential equation[J];Basic Sciences Journal of Textile Universities;2000-04
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