Multi-scale non-uniform hierarchical filtering model based on fractal theory.

Effect of wall thickness on trapping efficiency As shown in Fig 13 , an increasing trend in trapping efficiency is observed with the increase in wall thickness.

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However, after 11 s of layering, particles in the size range of 0.0016–0.0304 μm show a noticeable variation in trapping efficiency, while particles in other size ranges do not demonstrate a clear trend.

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The lower the trapping efficiency, the smaller the reduction in permeability, and the single-layer permeability shows a decreasing trend with time.

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