J. Hoferer, E. H. Hardy, J. Meyer, G. Kasper

Filtration, 2007, 7 (2), 154-158

This paper describes the application of magnetic resonance imaging (MRI) to obtain information on local particle mass deposition within fibrous filter media. The experimental set-up used for on-line loading experiments is also detailed. The required procedure to initially gather information on filter structure without destroying it, which is required when the same filter medium is later loaded with particles, is briefly presented as is the particle size-distribution of the particle material used to load the filter in comparison to a conventional test dust. Preliminary results are discussed for recording the loading process within a medium by visualization the local deposited mass at various loading stages. By using this non-destructive measuring technique which first allows measurement of the internal fiber structure followed by loading of the medium, it will be possible to compare the data with results of simulations and thereby allow validation of kinetic filter models.