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UP: Fachverband Umweltphysik

UP 10: Poster: Umweltphysik

UP 10.10: Poster

Donnerstag, 5. März 2009, 17:48–19:00, VMP 9 Poster

Numerical calculation of single fiber efficiency for fibrous filters — •Zienicke Egbert and Grille Hartmut — Institut für Physik, Technische Universität Ilmenau, 98684 Ilmenau

Aeosol filtration has high importance in medicin and environmental sciences to clean polluted air from particulate matter. New EU and US norms for the emission of particulate matter by Diesel engines have stimulated research with the goal to maximize filtering effectivity and to minimize the pressure drop of fibrous filters. A simple standard model of the filtration in fibrous filters is based on the Kuwabara flow around a single fiber in a defined cell volume. From this flow the deposition of micro and nano particles on the fiber is numerically computed by following the paths of the particles in the flow of the carrier gas under the action of Stokes friction and Brownian dynamics. The single fiber efficiency, determined by this procedure, is compared to the analytical approximations based on three echansisms: Interception, Intertial Impaction, and Brownian Diffusion, see [1]. This gives as a result the efficiency of a filter in the unloaded state, i.e. when it is free from deposited particulate matter. The results of our computations are also compared with experimental data. Our approach can be extended to the deposition of particulate matter on fibers with non-circular cross section or to fibers in the loaded state. To this aim our simulation program will be extended by a flow simulation part.

[1] William C. Hinds, Aerosol Technology, 2nd ed. (1999) John Wiley & sons, New York.