Non-reactive Working Fluids for Reliably Sensing Nanoparticles in Automotive Exhaust Gases

M. Kraft, T. Reinisch, A. Bergmann

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Nanoparticles in the exhausts of automotive internal combustion engines are routinely measured using condensation nuclei counting (CNC) sensors. Traditionally, n-butanol is used as working fluid for sensing combustion aerosols. However, when used on combustion engines burning modern, (partly) biogenic fuels, strong system drifts and reduced saturator lifetimes occur. This effect could be traced to non-volatile reaction products of acidic exhaust components with the alcoholic working fluid that poison the sensor, creating an immediate need for alternatives. Following fundamental theoretical considerations of the CNC principles, n-alkanes were identified as a new, advantageous class of working fluids. The materials have favourable thermal and diffusion properties, are chemically inert and condense efficiently on the carbonaceous nanoparticles of combustion aerosols and can be used with standard CNCs under standard conditions. Subsequent tests with linear alkanes in the C9 - C14 range proved their practical applicability as well as the validity of the underlying models.

Original languageEnglish
Pages (from-to)51-54
Number of pages4
JournalProcedia Engineering
Volume168
DOIs
Publication statusPublished - 2016

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Exhaust gases
Nanoparticles
Fluids
Paraffins
Aerosols
Condensation
Fuel systems
Sensors
Internal combustion engines
Butenes
Reaction products
Engines

Keywords

  • automotive exhaust analysis
  • condensation nucleus counter
  • nanoparticle sensor
  • system stability
  • working fluid

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Non-reactive Working Fluids for Reliably Sensing Nanoparticles in Automotive Exhaust Gases. / Kraft, M.; Reinisch, T.; Bergmann, A.

In: Procedia Engineering, Vol. 168, 2016, p. 51-54.

Research output: Contribution to journalArticleResearchpeer-review

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