Macro-scale modeling and simulation of two-phase flow in fibrous liquid aerosol filters

被引:13
作者
Baumann, Andre [1 ]
Hoch, Dennis [1 ]
Behringer, Jens [1 ]
Niessner, Jennifer [1 ]
机构
[1] Heilbronn Univ Appl Sci, Heilbronn, Germany
关键词
Liquid aerosol filtration; mist filtration; two-phase flow; fibrous porous media; CFD simulation; PRESSURE-DROP; FILTRATION; MEDIA;
D O I
10.1080/19942060.2020.1828174
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Similar to fine dust, liquid aerosols represent a risk to human health since small droplets may enter the respiratory system and cause health problems or severe diseases, such as COVID-19. Oil mist emissions from production processes and from air brakes are reduced by filters and by air dryer cartridges, respectively, while virus-like aerosols are removed by face-masks. Since the two-phase flow processes involved are highly complex and occur on vastly different scales ranging from the scale of single droplets and fibers up to the scale of a whole filter or face mask, the modeling and simulation is extremely challenging. In this work, we present a macro-scale approach for modeling and simulation of the two-phase flow processes in fibrous filters which allows predicting both pressure loss and filtration efficiency from new to steady-state where material parameters and constitutive relationships are obtained based on nano CT scans and micro-scale simulations. Compared to previous work, this approach starts from a physical basis as it relies on mass and momentum conservation and is then closed by material laws. Using this macro-scale approach it is found that both pressure loss and oil mass at steady-state are in good agreement with experimental findings.
引用
收藏
页码:1325 / 1336
页数:12
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