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Transferts de Chaleur et de Masse dans des Structures Poreuses Multi-échelles : Application à l'étude des Filtres à Particules Diesel

Abstract : Ceramic filters appear to be the most promising solution to deal with the future emission standard requirements for diesel-powered vehicles. Indeed, this kind of Diesel Particulate Filters is known to provide high collection efficiency for carbon particles. The analysis and modelling of the physical phenomenon involved in their functioning is required to improve their performances and durability. First, the gas flow, the particle transport and collection within the filter are studied. Given its particular multi-scale structure, an “effective porous media” analysis is used in order to model the mass transfers in the whole filter. The model is based on 1D equations, obtained for a representative unit cell of the filter, preserving the flow inertial behaviour. In a second part, the thermal behaviour of the apparatus is studied. Heat transfers within the apparatus are described using a macro-scale one-temperature model obtained from a volume averaging scale-change analysis. A combustion source term is used to describe the oxidation reaction involved in the filter cleaning.
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https://tel.archives-ouvertes.fr/tel-00007594
Contributor : Laurent Oxarango <>
Submitted on : Wednesday, December 1, 2004 - 11:47:02 AM
Last modification on : Friday, October 23, 2020 - 4:41:13 PM
Long-term archiving on: : Thursday, September 13, 2012 - 1:20:27 PM

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Laurent Oxarango. Transferts de Chaleur et de Masse dans des Structures Poreuses Multi-échelles : Application à l'étude des Filtres à Particules Diesel. Dynamique des Fluides [physics.flu-dyn]. Institut National Polytechnique de Toulouse - INPT, 2004. Français. ⟨tel-00007594⟩

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