Partic. vol. 40 pp. 70-79 (October 2018)
doi: 10.1016/j.partic.2017.11.008

Particle penetration in fiber filters

Norbert Riefler^a,*, Martina Ulrich^b, Marko Morshäuser^b, Udo Fritsching^a,c

riefler@iwt.uni-bremen.de

Abstract

Particle separation from gases is an important unit operation in manifold industrial applications, such as those conducted in environmental protection. For analysis of particle penetration and separation in fiber filters, standard dust particles (Al₂O₃) were loaded in the gas flow of a filter test facility and deposited within new and uncharged fiber filters. The loaded filters were analyzed by micro-computer tomography and scanning electron microscopy. Three-dimensional tomograms of the samples show an exponential decay of the penetration depth of the particles. This dependency is confirmed by simulations conducted using the discrete element method coupled with computational fluid dynamics within unloaded and loaded fiber structures. Microscale processes of particle separation at the fibers as well as the filtration efficiency and time-dependent filtering process are derived from the simulations. Local particle clustering in the filter medium and partial filter clogging are thus identified.

Graphical abstract

Keywords

Particle filtration; Fiber filter; X-ray microtomography; Computational fluid dynamics–discrete element method coupling; High-fidelity simulation; Transient mesh morphing