Design Criteria of Metallic Substrates for Future Catalyst Applications; Part III

Bergmann, Andrée; Brück, Rolf; Kruse, C.; Schindler, A.

doi:10.4271/971027

Cited by 8 publications

(2 citation statements)

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“…These micro-corrugations support the intense exchange of unconverted gases between the channel core and the walls, thereby locally increasing the mass transfer coefficient. Previous [5] experience shows that it is possible to reduce the volume through the use of TS technology. TS technology was chosen for the purpose of this paper in order to gain a better understanding of the properties of catalytic activity and of pressure drop performance using typical motorcycle cell densities and dimensions.…”

Section: Transversal Structure Technologymentioning

confidence: 99%

Changing the Substrate Technology to meet Future Emission Limits

Pace

Presti

2010

SAE Int. J. Fuels Lubr.

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Future stringent emission legislation will require high efficient catalytical systems. Along with engine out emission reduction and advanced wash coat solution the substrate technology will play a key role in order to keep system costs as low as possible. The development of metallic substrates over the past few years has shown that turbulent-like substrates increase specific catalytic efficiency. This has made it possible to enhance overall performance for a specific catalytic volume or reduce the volume while keeping catalytic efficiency constant. This paper focuses on the emission efficiency of standard, TS (Transversal Structure) and LS (Longitudinal Structure) metallic substrates. In a first measurement program, standard TS and LS substrates have been compared using a 150cc 4 Stroke engine in dynamic (ECE R40) conditions. In a second test standard and LS substrate have been tested. Both TS and LS technologies show advantage compared to standard technology but have different application fields: TS is a cost effective solution for next emission limits while LS is a possible solution for future stringent emission limits.

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Section: Transversal Structure Technologymentioning

confidence: 99%

Changing the Substrate Technology to meet Future Emission Limits

Pace

Presti

2010

SAE Int. J. Fuels Lubr.

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“…The idea of disturbing the flow by wall inclinations has been commercialized in the Emitec TS, which is a metal monolith with triangular channels with small, rounded corrugations; see Figure b. These corrugations have been found to improve the mass-transfer rate by about 15%, but at the same time the pressure drop was increased by 14−18% . Finally, Figure c shows the Behr MS design, in which the channels are cut and displaced to generate repeated inlet disturbances of the flow …”

Section: Introductionmentioning

confidence: 99%

Enhanced Mass Transfer in Monolith Catalysts with Bumps on the Channel Walls

Holmgren

1999

Ind. Eng. Chem. Res.

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The mass-transfer rate in metallic triangular monolith channels with small protuberances on the channel walls was measured and compared with conventional, straight channels without bumps. The CO oxidation reaction was used to estimate the mass-transfer rates. Measurements were made at Reynolds numbers between 300 and 1400. The channels were 3.7 mm wide and 2.6 mm high and had a length of 96.5-152 mm. Two different bump heights were investigated: 1 and 1.2 mm. Moreover, the distance between the bumps as well as the distance from the inlet to the first bump was varied. It was found that the protuberances increase the mass-transfer rate, expressed as the Sherwood number. The increase was higher when the Reynolds number was increased. There was also a penalty of increased pressure drop. However, when the j D factor for mass transfer was compared with the friction factor f, it was found that the increase in mass transfer was generally higher than the increase in pressure drop.

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