Implementation of the Effectiveness-Ntu Methodology for Catalytic Converter Design Delphi Energy and Engine Management Systems

Format:

Conference/Event

Author/Creator:

Blanchet, Scott, author.

Conference Name:

International Congress & Exposition (1998-02-23 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1998

Summary:

Design of automotive catalytic converters is a complex process involving the optimization of many physical and chemical variables. Often, simple characteristics such as geometric surface area and space velocity are used to compare alternative designs. Unfortunately, these parameters do not account for all of the relative variables affecting emissions performance. The effectiveness-Ntu methodology, developed for heat exchanger design, can be extended to catalytic converter design through the heat and mass transfer analogy. This technique allows comparisons to include all physical variables affecting emissions performance. This paper presents Ntu-based, catalyst performance criteria for steady state and transient emissions and exhaust flow restriction. The theoretical analysis includes the effects of washcoat on cell geometry and, subsequently, on heat/mass-transfer performance. Additionally, the impact of chemical variables, such as PGM load, are coupled with the mass-transfer-limited analysis through a reaction resistance analogy. Experimental measurements of engine emissions and pressure drop support the theoretical results

Notes:

Vendor supplied data

Publisher Number:

980673

Access Restriction:

Restricted for use by site license