首页|Alternative methods to measure aerosol penetration through a filter
Alternative methods to measure aerosol penetration through a filter
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
? 2022 The AuthorPenetration of 3–10 nm particles through a metal grid has been measured using different experimental methodologies. Two basic schemes have been compared: (i) the upstream-downstream (UD), where particle penetration is determined from comparison between the aerosol number concentrations measured at two sampling points, one placed upstream, the other downstream, of the filter; and (ii) the filter-dummy (FD), in which penetration is determined from comparison of number concentrations measured at the outlet of two geometrically identical chambers, one empty and the other containing the filter. The test aerosol facing the grid was either monodisperse (MONO) or polydisperse (POLY). The UD method requires the additional measurement of particle penetration (without filter) through the flow path between the two sampling points and it is thus a more time consuming strategy, but it has the advantage that fabrication of an additional dummy holder is not needed. UD + MONO and FD + MONO gave results in good agreement with the well-established fan filter model theory of Cheng and Yeh. The results obtained with the FD + POLY method, the fastest one, were less precise and accurate. As far as diffusional capture of particles is concerned, the MONO method (using either the UD or FD basic schemes) should be preferred for accurate measurement of filter efficiency; the POLY method should perhaps be more suitable for a quick evaluation of the overall performance of a given filtration system.
Alonso M.
展开 >
National Center for Metallurgical Research (CENIM – CSIC)
NSTL
Elsevier
