Hydrocarbon condensation in heavy-duty diesel exhaust

J. Ristimäki, Kati Vaaraslahti, Maija Lappi, Jorma Keskinen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)

Abstract

The semivolatile mass fraction of diesel exhaust particles was studied using size-resolved on-line techniques (DMA-ELPI; TDMA-ELPI).
The average density of the semivolatile liquid on the particles was measured to be approximately 0.8 g/cm3. The measured size resolved values of mass transfer imply that condensation, or diffusion-limited mass transfer, plays a major role in driving the volatile matter to the diesel exhaust particles.
The measured mass change values correspond to highly size dependent mass fractions for the semivolatile component, ranging from approximately 20−80%. Integrated over particle size distribution, the volatile mass fractions were 25 and 45% for the two load points studied.
Calculation, based on the measured particle properties, indicates that only 10% volatile mass fraction could be explained by monolayer adsorption.
The size resolved changes in particle effective density, fractal dimension, volatile mass fractions and mass are all in agreement with theoretical considerations of condensation.
Original languageEnglish
Pages (from-to)6397-6402
JournalEnvironmental Science & Technology
Volume41
Issue number18
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Fingerprint

Vehicle Emissions
Hydrocarbons
diesel
condensation
Condensation
Mass transfer
hydrocarbon
Time division multiple access
Dynamic mechanical analysis
Fractal dimension
Particle size analysis
Monolayers
Adsorption
Liquids
mass transfer
particle size
particle
adsorption
liquid

Keywords

  • diesel
  • diesel engine exhaust
  • diesel exhaust
  • diesel exhaust emission control
  • heavy-duty vehicles

Cite this

Ristimäki, J. ; Vaaraslahti, Kati ; Lappi, Maija ; Keskinen, Jorma. / Hydrocarbon condensation in heavy-duty diesel exhaust. In: Environmental Science & Technology. 2007 ; Vol. 41, No. 18. pp. 6397-6402.
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title = "Hydrocarbon condensation in heavy-duty diesel exhaust",
abstract = "The semivolatile mass fraction of diesel exhaust particles was studied using size-resolved on-line techniques (DMA-ELPI; TDMA-ELPI). The average density of the semivolatile liquid on the particles was measured to be approximately 0.8 g/cm3. The measured size resolved values of mass transfer imply that condensation, or diffusion-limited mass transfer, plays a major role in driving the volatile matter to the diesel exhaust particles. The measured mass change values correspond to highly size dependent mass fractions for the semivolatile component, ranging from approximately 20−80{\%}. Integrated over particle size distribution, the volatile mass fractions were 25 and 45{\%} for the two load points studied. Calculation, based on the measured particle properties, indicates that only 10{\%} volatile mass fraction could be explained by monolayer adsorption. The size resolved changes in particle effective density, fractal dimension, volatile mass fractions and mass are all in agreement with theoretical considerations of condensation.",
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author = "J. Ristim{\"a}ki and Kati Vaaraslahti and Maija Lappi and Jorma Keskinen",
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doi = "10.1021/es0624319",
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Hydrocarbon condensation in heavy-duty diesel exhaust. / Ristimäki, J.; Vaaraslahti, Kati; Lappi, Maija; Keskinen, Jorma (Corresponding Author).

In: Environmental Science & Technology, Vol. 41, No. 18, 2007, p. 6397-6402.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Hydrocarbon condensation in heavy-duty diesel exhaust

AU - Ristimäki, J.

AU - Vaaraslahti, Kati

AU - Lappi, Maija

AU - Keskinen, Jorma

PY - 2007

Y1 - 2007

N2 - The semivolatile mass fraction of diesel exhaust particles was studied using size-resolved on-line techniques (DMA-ELPI; TDMA-ELPI). The average density of the semivolatile liquid on the particles was measured to be approximately 0.8 g/cm3. The measured size resolved values of mass transfer imply that condensation, or diffusion-limited mass transfer, plays a major role in driving the volatile matter to the diesel exhaust particles. The measured mass change values correspond to highly size dependent mass fractions for the semivolatile component, ranging from approximately 20−80%. Integrated over particle size distribution, the volatile mass fractions were 25 and 45% for the two load points studied. Calculation, based on the measured particle properties, indicates that only 10% volatile mass fraction could be explained by monolayer adsorption. The size resolved changes in particle effective density, fractal dimension, volatile mass fractions and mass are all in agreement with theoretical considerations of condensation.

AB - The semivolatile mass fraction of diesel exhaust particles was studied using size-resolved on-line techniques (DMA-ELPI; TDMA-ELPI). The average density of the semivolatile liquid on the particles was measured to be approximately 0.8 g/cm3. The measured size resolved values of mass transfer imply that condensation, or diffusion-limited mass transfer, plays a major role in driving the volatile matter to the diesel exhaust particles. The measured mass change values correspond to highly size dependent mass fractions for the semivolatile component, ranging from approximately 20−80%. Integrated over particle size distribution, the volatile mass fractions were 25 and 45% for the two load points studied. Calculation, based on the measured particle properties, indicates that only 10% volatile mass fraction could be explained by monolayer adsorption. The size resolved changes in particle effective density, fractal dimension, volatile mass fractions and mass are all in agreement with theoretical considerations of condensation.

KW - diesel

KW - diesel engine exhaust

KW - diesel exhaust

KW - diesel exhaust emission control

KW - heavy-duty vehicles

U2 - 10.1021/es0624319

DO - 10.1021/es0624319

M3 - Article

VL - 41

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JO - Environmental Science & Technology

JF - Environmental Science & Technology

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ER -