Fluid flow and particle capture mechanisms in pleated fibrous filters developed for automotive gas filtration are analyzed as a first step towards the development of computational sizing and design tools The study is performed at four different scales the fibre, the fibrous medium, the pleated medium and the filter system. The net pressure drop through a filter panel is studied as functions of pleat density and length using both experimental measurements and CFD simulations. The fluid flow at this scale is characterized by high filtration and channel Reynolds numbers (Rew nearly equal to 70 - 200, Rec up to 1800), which leads to similar flat velocity profiles over a large fraction of the pleat length both in the entrance and exit channels. The existence of a similarity solution, which is consistent with the work of Brady, opens up the possibility of a semi-analytical modelling of the flow within the pleats. The semi-analytical model has several advantages over experimental trials or standard CFD calculations. It facilitates the parametric study of the filter and the optimisation of pleat characteristics at minimal time and money cost. Moreover, the study of pressure drop evolution during filtration is easier with this model.
A semi-analytical model for fluid flow in high efficiency pleated filters for gas filtration
Halbanalytisches Modell für die Strömung in hocheffizienten Faltenfiltern für die Gasfiltration
2007
8 Seiten, 7 Bilder, 16 Quellen
Conference paper
English
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