Morphology of particulate deposits formed on a single filter fibre by exposure to mixed aerosol flow
Morphology of particulate deposits formed on a single filter fibre by exposure to mixed aerosol flow
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DOI：
10.1016/j.jaerosci.2020.105718
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发表时间：
2021-02-01
影响因子：
4.5
通讯作者：
Dittler, Achim
中科院分区：
文献类型：
--
作者：
Zoller, Julian;Zargaran, Amin;Dittler, Achim
单纤维实验通常用于更深入地了解纤维过滤器中的颗粒沉积。文献中关于颗粒在单纤维上沉积的大多数研究使用单一颗粒种类的单分散颗粒。在这项研究中，一个单一的过滤器纤维暴露于含有两种颗粒物质，即玻璃球和/或烟灰颗粒的气溶胶，以比较所得的颗粒沉积物的形态。单独的玻璃球在纤维的前侧/迎风侧上构建致密的沉积物，并且单独的烟灰颗粒在纤维的前侧上形成颗粒枝晶，其宽至垂直于流动的侧面。将纤维暴露于含有玻璃球和烟灰颗粒的气溶胶中，导致纤维正面的颗粒结构更大。如果纤维首先暴露于仅含有烟灰颗粒的气溶胶中，然后暴露于仅含有玻璃球的气溶胶中，则玻璃球沉积在烟灰枝晶的前面。相反的程序导致在致密的玻璃球沉积物的顶部上的烟灰枝晶，其位于纤维的前面。
Single fibre experiments are commonly used to obtain a deeper understanding of particle deposition in fibrous filters. Most studies on particle deposition on single fibres in literature use monodisperse particles of a single particulate species. In this study, a single filter fibre was exposed to aerosols containing two particulate species, namely glass spheres and/or soot particles, in order to compare the morphology of the resulting particulate deposits. The glass spheres alone build compact deposits on the front/windward side of the fibre and the soot particles alone formed particle dendrites on the front of the fibre, which reached wide to the sides perpendicular to the flow. Exposure of the fibre to an aerosol containing both, glass spheres and soot particles, resulted in bigger particulate structures on the front of the fibre. If the fibre was exposed to an aerosol containing only soot particles first and to an aerosol containing only glass spheres afterwards, the glass spheres deposited on the front of the soot dendrites. The reversed procedure resulted in soot dendrites on the top of the compact glass sphere deposits, which were located on the front of the fibre.