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Correcting mass measurement of diesel particulate filters at non-ambient temperatures

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journal contribution
posted on 12.06.2009, 14:44 by Andrew Williams, Colin Garner
Diesel particulate filters (DPFs) are becoming a widespread method for reducing the particulate matter (PM) emissions from both on-highway and off-highway automotive diesel engines. Mass measurements of DPFs are commonly used to determine rapidly both the amount of PM trapped by the filter and the amount regenerated (removed) by regeneration systems. To avoid issues with adsorption of atmospheric water the filters are often weighed at elevated temperatures. It is shown in this work that at elevated temperatures the filters weigh less than at lower temperatures as a direct result of the buoyant hot air within the filter substrate. This study shows that consideration of the buoyancy forces allows for correction of the mass measurement for the errors relating to the non-ambient temperature of the filter, allowing mass measurements at elevated temperatures while avoiding adsorption of atmospheric water on to the filter substrate and, therefore, improving the accuracy of mass-measurement-based studies of filtration and regeneration performance of DPFs. It is demonstrated that a filter with approximately 85 per cent overall porosity weighed at 150 °C in ambient temperatures will have an error of about 0.3 g/l (typically about 10 per cent of the trapped PM mass) in the mass measurement when not correcting for the temperature. By way of an example, this is shown to have potentially an important effect on the calculated trapped PM.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

WILLIAMS, A.M. and GARNER, C.P., 2009. Correcting mass measurement of diesel particulate filters at non-ambient temperatures. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 223(1), pp. 99-105.

Publisher

Professional Engineering Publishing / © IMECHE

Version

VoR (Version of Record)

Publication date

2009

Notes

This is an article from the journal, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering [© IMechE ]. It is also available at: http://dx.doi.org/10.1243/09544070JAUTO834

ISSN

0954-4070

Language

en