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Intra-channel mass and heat-transfer modeling in diesel oxidation catalysts

K. Chakravathy, C.S. Daw, J.C. Conklin
Oak Ridge National Laboratory
Knoxville TN 37932-6472

We consider the effect of intra-channel mass and heat transfer in modeling the performance of diesel oxidation catalysts. Many modeling studies have assumed that the intra-channel flow is laminar and, thus, heat and mass transfer between the bulk gas and wall are appropriately described using correlation for fully-developed laminar flow. However, recent measurements of CO and hydrocarbon oxidation in diesel exhaust reveal that actual mass-transfer rates can deviate significantly from those predicted by such correlations. In particular, it is apparent that there is a significant dependence of the limiting mass-transfer rate on the channel Reynolds number. Other studies in the literature have revealed similar behavior for heat transfer. We speculate that this Reynolds number dependence results from boundary-layer disturbances associated with washcoat surface roughness and/or porosity. When we apply experimental mass and heat-transfer correlations to multichannel simulations of diesel oxidation catalyst, the steady-state conversions differ significantly from those obtained assuming fully-developed laminar flow. These results suggest that assuming fully-developed laminar flow may not always be appropriate.

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Chakravarthy K, Daw CS, Conklin JC (2002). Intra-channel mass and heat-transfer modeling in diesel oxidation catalysts. To be presented at the Future Car Congress (SAE) (Arlington, Virginia USA; 2002 June 03-05).
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