Abstract
It is difficult to quickly calculate the performance of the air filter media, especially regarding the dynamic particle-capture process. In this study, the geometric and topological features of the existing particle-deposition morphologies based on three different particle-capture mechanisms (diffusion, inertia, interception) were extracted, and a single-fiber particle-deposition model was established. Through a computational fluid dynamics (CFD) simulation, the resistances in different particle-capture stages were calculated, and it was proved that the model can realize rapid calculation of the dynamic particle-capture process. Since no force analysis of particles is required, calculation resources were greatly conserved. Based on this, the study found that for diffusion, the packing density (Sp) of the deposited particles has a large impact on the resistance, subsequently leading to underestimation of the resistance by the two-dimensional (2D) model. Interception needs to be considered with inertia, and the ratio of the two (I/R) is the key factor that affects the resistance.
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