Abstract

The deposition of aerosol nanoparticles has been studied in a model granular filter composed of parallel monolayers of contacting spherical granules with a square packing, where each even monolayer is shifted in its plane relative to an odd layer by the granule radius in two directions normal to one another. The monolayers of the granules are oriented normal to an incident flow. The efficiencies of diffusion collection of point particles by the granules have been calculated as depending on the distance between the layers in the regime of a three-dimensional gas flow at small Reynolds numbers \(\operatorname{Re} \) \( \ll \) 1 within a Peclet number range of \({\text{Pe}}\) = 10²−10⁴. The calculation results have agreed with the published data and the results of measuring the deposition of monodisperse nanoparticles from nitrogen and helium upon filtration through layers of monodisperse metal spheres. The possibility of using a layer of granules as a diffusion battery for measuring the sizes of aerosol particles has been discussed.

中文翻译：

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纳米颗粒在颗粒层中的扩散沉积

摘要

在模型颗粒过滤器中研究了气溶胶纳米颗粒的沉积，该模型颗粒过滤器由接触球形颗粒的平行单层与正方形填料组成，其中每个偶数单层在其平面中相对于奇数层在垂直于一个的两个方向上相对于奇数层移动了颗粒半径另一个。颗粒的单层定向成垂直于入射流。根据小雷诺数\（\ operatorname {Re} \） \（\ ll \ ） 1在\（{\ text {Pe}} \）的Peclet数范围内= 10 ² -10 ⁴。计算结果与已公布的数据以及通过单分散金属球层过滤后测量氮和氦中单分散纳米颗粒沉积的结果相吻合。已经讨论了使用颗粒层作为扩散电池来测量气溶胶颗粒尺寸的可能性。