Abstract
In this work, a study was carried out to compare the filtering and hydrodynamic properties of granular filters with solid spherical granules and spherical granules with modifications in the form of micropores. We used the discrete element method (DEM) to construct the geometry of the filters. Models of granular filters with spherical granules with diameters of 3, 4, and 5 mm, and with porosity values of 0.439, 0.466, and 0.477, respectively, were created. The results of the numerical simulation are in good agreement with the experimental data of other authors. We created models of granular filters containing micropores with different porosity values (0.158–0.366) in order to study the micropores’ effect on the aerosol motion. The study showed that micropores contribute to a decrease in hydrodynamic resistance and an increase in particle deposition efficiency. There is also a maximum limiting value of the granule microporosity for a given aerosol particle diameter when a further increase in microporosity leads to a decrease in the deposition efficiency.
Highlights
There are many types of filters, each of which performs its tasks and works under certain conditions [1,2]
This paper presents a Computational Fluid Dynamics (CFD) simulation of the motion of aerosol particles in granular filter models created by discrete element method (DEM) for spherical granules with a diameter of 3, 4, and 5 mm
We carried out a numerical simulation of aerosol motion in models of granular filters with granules of various sizes, i.e., 3, 4, and 5 mm in diameter
Summary
There are many types of filters, each of which performs its tasks and works under certain conditions [1,2]. Chemicallyresistant materials in the chemical industry can be used as catalysts [4,5,6,7]. Granular filters can be divided into several types; these are filters with moving, fixed, and fluidized beds. Fixed bed filters have a low particle deposition efficiency relative to other filters, and cannot operate without stopping. Moving bed filters have the highest particle deposition efficiency, and can be operated continuously [8]. Despite the low efficiency and the lack of the ability to work non-stop, the most common of these three types is the fixed bed filter; this is due to its greater reliability and availability, and the simplicity of modeling and predicting the filter parameters in it
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