Computational fluid dynamics (CFD) analysis for a catalytic converter design
Design of catalytic converters involves four major components including casing, washcoat, catalyst and substrate. However, the design process is complicated as it involves various parameters. One of the problems faced by designers is obtaining the performance of catalytic converters where the...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7449/1/24p%20SHAHRIN%20HISHAM%20AMIRNORDIN.pdf http://eprints.uthm.edu.my/7449/2/SHAHRIN%20HISHAM%20AMIRNORDIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7449/3/SHAHRIN%20HISHAM%20AMIRNORDIN%20WATERMARK.pdf |
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| Summary: | Design of catalytic converters involves four major components including
casing, washcoat, catalyst and substrate. However, the design process is complicated
as it involves various parameters. One of the problems faced by designers is
obtaining the performance of catalytic converters where the substrate is made up of a
large number of cells. Therefore, an effort to solve the problem using Computational
Fluid Dynamics (CFD) with an alternative modeling technique is deployed. This study
involved a preliminary design which employed an adapted sub-grid scale modeling as
an alternative method for the analysis of substrate performance. The Pahl and Beitz's
model was applied in the design process. The adapted sub-grid scale modeling was
used to predict the pressure loss, select the cell shape and produce the performance
chart which could show the relationship between the parameters involved. The
proposed adapted sub-grid scale modelling method was found to give results within 5
% error which was better compared to the single channel method. Results also
indicated the advantage of hexagonal-shaped over square-shaped cells in terms of
pressure loss where the fonner showed a 43 % lower value than the latter. The
Mechanical-Chemical Performance Mapping (MCPM) was finally obtained. The
mapping could be used to assist in the substrate design of catalytic converters. |
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