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A semi-analytical model for gas flow in pleated filters

Rebaï, Medhi and Prat, Marc and Meireles, Martine and Schmitz, Philippe and Baclet, René A semi-analytical model for gas flow in pleated filters. (2010) Chemical Engineering Science, vol. 65 (n° 9). pp. 2835-2846. ISSN 0009-2509

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Official URL: http://dx.doi.org/10.1016/J.CES.2010.01.014

Abstract

Asemi-analyticalmodel of gas flow in pleated fibrous filters is developed for large filtration velocities. This case presents two main new and distinguishing features compared to the low filtration velocity situations studied in previous works: the velocity profiles are not parabolic within the pleat channels and the filtration velocity is not uniform along the pleatedfilter element and this has a great impact on the filter loading. The model relies on similarity solutions to the Navier–Stokes equations in the channels formed by pleating the filter medium. After validation by comparison with direct CFD simulations and experimental data, the model is used to determine the optimal pleat density, i.e. the pleat density minimizing the overall pressure drop across the filter for given flow rate, pleat length and given filter medium properties. As illustrated in the paper, this model greatly facilitates the study of flow within the pleatedfilter compared to a standard CFD approach. It represents an excellent basis for the more involved problem of filter loading computation. In particular, no remeshing across the width of the pleatedfilter entrance channels is needed when a filtration cake forms at the channel walls.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at : http://www.sciencedirect.com/science/article/pii/S000925091000031X
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut National de la Recherche Agronomique - INRA
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
Other partners > MECAPLAST Group (MONACO)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By:Audrey LEFEVRE

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