Two-dimensional Modeling of Nanoparticle Collection Efficiency in Bimodal Filters

摘要

In this work, a series of 2-D numerical simulations are formulated to study the collection efficiency of bimodal filters when challenged with nanoparticles (d_p < 100 nm). Our simulation results are used in establishing a unimodal equivalent diameter for the bimodal media thereby taking advantage of the existing expressions of unimodal filters for capture efficiency prediction in the entire range of mass (number) fractions, 0 ≤ n_c ≤ 1, with fiber diameter ratios , 1 ≤ R_(cf) ≤ 7, and solidities of 5 to 15 percent. We also discuss the influence of R_(cf) and n_c on the filters' quality factor when challenged with nanoparticles.