Research on Microchannel Flow Field and Filtration Characteristics of Two-dimensional Fiber Layer

Abstract

In the multi-scale study of fiber filtration mechanism, this study investigates the regulation mechanism of aerosol deposition behavior by shaped fiber layers through numerical simulation system. A two-dimensional model is constructed for circular fiber layer, square fiber layer, and r=1, 2, 3 curved angular fiber layer. Based on the transient gas-solid coupling algorithm, we analyze the dynamic deposition process of particles under unsteady conditions, focus on the synergistic effects of Brownian diffusion, inertial collision, and interception effect in the transport of particles with multiple particle sizes, and analyze the effects of these factors on the deposition of particles on fibers and the performance of fiber trapping. The study reveals that as the competitive relationship between Brownian diffusion and inertial collision to achieve an optimal balance of capture efficiency and pressure loss in submicron particle filtration - sharp corners (e.g., square, r=1) enhance local turbulence and diffusive interception at the expense of flow field stability, while smooth curvature (e.g., round, r=3) suppresses separation eddies, reduces energy consumption, but weakens the diffusion effect - needs to be A compromise curvature (e.g., r=2) is chosen based on the target particle size (R-value) and flow velocity to synergize the inertia-diffusion capture path.