RESEARCH NOTE:MEASURING PARTICLE DEPOSITION WITHIN FIBROUS FILTER MEDIA BY MAGNETIC RESONANCE IMAGING

摘要

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 dis tribution of the particle material used to load the filter in comparison to a conventional test dust.Preliminary re sults are discussed for recording the loading process within a medium by visualizing the local deposited mass at various loading stages.By using this non-destructive measuring technique which first allows measurement of the internal fibre 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.