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Outline
A dynamic filtration model of the gasoline particulate filter(GPF) was developed，considering both pore and wall scales，with the addition of radial porosity heterogeneity in the porous media. The impact of internal structural changes in the GPF on particle filtration performance was investigated from the perspectives of filtration mechanisms and microscopic size. It is found that the primary filtration mechanisms in the GPF are Brownian diffusion and interception，which correspond to the filtration of small particles(<30nm) and large particles(>200nm)，respectively. When the mean pore size in the GPF decreases or the pore size variance increases，the proportion of collectors with diameters smaller than 10μm increases. This results in a higher number of collectors achieving more than 50% filtration efficiency for particles in the range of 10—300nm，thereby enhancing the total filtration efficiency of the GPF. After 20minutes of particle filtration，the filtration efficiency of GPF increases and the particles adhere to the area of the lowest porosity，where the porosity reduces. However，the efficiency of Brownian diffusion and interception slightly decreases，indicating that porosity plays a dominant role in influencing filtration efficiency during the dynamic filtration process.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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