Abstract
Applications for porous materials range from structural materials to filters and acoustic absorbers. In many of these applications, e.g. silencers or air filters, the porous material is exposed to dirt. Fouling of filter materials and acoustic absorbers can change their characteristics by blocking pores, changing the pore morphology and decreasing the porosity. As parameters like trade efficiency and flow resistivity, that are important for the functionality of filters and acoustic absorbers, depend on the porosity and pore morphology, the fouling behaviour of porous materials is of major interest. In this study porous metals with different pore morphologies and porosities are investigated, such as microperforated panels, sintered fiber felts, metal foams and nanoporous superalloy membranes. The materials are mounted on a roof rack and polluted for a period of six month. The samples are periodically examined for changes in geometrical characteristics and flow resistivity. The materials are characterized using three dimensional CT-images as well as two dimensional microscopy images. Finally the correlation of geometrical characteristics, fouling behaviour and flow resistivity is outlined.
Published Version
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