Modeling of flow dynamics in laminar aerosol flow tubes

Alexei F. Khalizov, Michael E. Earle, Wayde J.W. Johnson, Gordon D. Stubley, James J. Sloan

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Flow behaviour in laminar aerosol flow tubes was investigated using a Computational Fluid Dynamics (CFD) model. Since these flow tubes are typically operated at low gas velocity, even small temperature gradients produce convection currents strong enough to interfere with laminar flow. This results in recirculation, causing the residence times of aerosol particles to be poorly defined. The situation is exacerbated when temperature inversions are present, or when the flow direction and temperature are changed simultaneously. We analyzed several characteristic flow tube configurations to define the range of experimental conditions that will ensure a laminar flow profile with minimal recirculation. For a laminar flow situation, we evaluated the extent of diffusion-controlled exchange between aerosol and the flow tube wall.

Original languageEnglish (US)
Pages (from-to)1174-1187
Number of pages14
JournalJournal of Aerosol Science
Volume37
Issue number10
DOIs
StatePublished - Oct 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Pollution
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Atmospheric Science

Keywords

  • Aerosol
  • Atmosphere
  • Computational fluid dynamics
  • Flow tube
  • Infrared spectroscopy

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