Diffusive deposition of aerosols in a fibrous filter

Experimental deposition efficiencies for deposition from laminar flow in fibrous filters containing variable numbers of layers were obtained by Jackiewicz, Balazy and Podgorski (2008). In the work presented here a particular case of their data for deposition onto filters with 1-9 layers is analysed in detail. Its dependence on layer depth is shown to be remarkably similar to the dependence on length of diffusive deposition from similar laminar flow in a cylindrical tube of a chosen radius. The observed mean layer deposition is shown to be consistent with theoretical predictions of deposition by diffusion and interception in the standard cell model. A reason for a larger than average deposition on the first layer is that many fibres in that layer remove particles from the initial particle concentration.