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Catalyst simulations based on coupling of 3D CFD tool with effective 1D channel models

Paper ID Volume ID Publish Year Pages File Format Full-Text
55468 47054 2012 7 PDF Available
Title
Catalyst simulations based on coupling of 3D CFD tool with effective 1D channel models
Abstract

Spatially 1D simulations of exhaust gas catalysts are often used in the automotive industry because of short computation times. In fully 3D CFD-based model, the computational requirements increase by several orders of magnitude. A novel approach to 3D simulations of complete exhaust gas aftertreatment systems is proposed in this paper. It is based on a modular combination of standard CFD tool with a user-defined 1D channel model. The employment of external 1D channel model enables more effective computations and gives maximum freedom in definition of realistic reaction kinetics, including non-linear rate laws and fully transient solution of adsorbed components.The approach is validated by comparison of the results from the stand-alone 1D model and single channel CFD simulation. Dynamic simulations of CO oxidation light-off and lean/rich operation of NOx storage catalyst (NSRC, LNT) are then conducted in a test geometry with 10 representative channels and skewed inlet/outlet pipes. Finally, a complex system including bent pipes and conical expansion/constriction parts is simulated with 80 representative channels. It is demonstrated that relatively large deviations can exist between the individual channels. Non-uniform inlet flow distribution affects light-off behaviour as well as breakthrough of adsorbed components, and it may also lead to a different extent of catalyst ageing in individual channels. The combined 3D CFD and 1D channels simulation approach represents an effective tool for analysis of such problems and can help with the design of more efficient exhaust gas aftertreatment systems.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (91 K)Download as PowerPoint slideHighlights► Novel approach to 3D simulations of exhaust gas aftertreatment systems. ► Combination of standard CFD tool with external, user-defined 1D channel model. ► Complex geometry, realistic reaction kinetics, dynamic simulations. ► Geometry and inlet flow distribution determines light-off in individual channels. ► CO oxidation and NOx storage/reduction cycling simulated.

Keywords
1D, spatially 1-dimensional; 3D, spatially 3-dimensional; CFD, computational fluid dynamics; DOC, diesel oxidation catalyst; LNT, lean NOx trap (=NSRC); NH3-SCR, selective catalytic reduction of NOx by ammonia; NSRC, NOx storage and reduction catalyst (=L
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Catalyst simulations based on coupling of 3D CFD tool with effective 1D channel models
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 188, Issue 1, 1 July 2012, Pages 87–93
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us