Numerical simulation of the formation of pollutant nanoparticles in the exhaust twin-jet plume of a moving car

Z. Q. Yin, J. Z. Lin, K. Zhou, Tat Leung Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

The concentration and size of particulate matter (PM) in atmosphere have a severe impact on human health. Diesel vehicle engines generate great abundant nanoparticles. The large eddy simulation (LES) was combined with the equations of nucleation and coagulation to study the flow structure and the formation of pollutant nanoparticles H2SO4droplets in the flow around an on-road two tailpipes sedan. The effects of different ambient wind speeds and exhaust gas speeds on the particle number concentration and size distributions have been studied. The results show that the ratio of the ambient wind velocity to exhaust gas velocity greatly affect the flow structure, and further affect the nanoparticle concentration and size distribution. A higher ambient wind speed reduces the formation rate of nanoparticles and increases nanoparticle size. This study contributes to a better understanding of the number concentration and size distribution of nanoparticles which form through a nucleation process and transform as the subsequent coagulation after the formation.
Original languageEnglish
Pages (from-to)535-543
Number of pages9
JournalInternational Journal of Nonlinear Sciences and Numerical Simulation
Volume8
Issue number4
DOIs
Publication statusPublished - 1 Jan 2007

Keywords

  • Coagulation
  • Diesel exhaust
  • Nucleation
  • Numerical simulation
  • Twin-jet plum

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Computational Mechanics
  • Modelling and Simulation
  • Engineering (miscellaneous)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Applied Mathematics

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