Experimental Investigation of the Effect of NaCl Additive on the Formation and Evolution of Particles in a Diffusion Flame

  • Author / Creator
    Moallemi, Alireza
  • Formation and evolution of nano-particles in a laminar co-flow methane diffusion flame were investigated under two conditions: a pure methane flame and a methane flame doped with NaCl particles. Samples of nano-particles from different heights above the burner were extracted by a probe sampling system designed to dilute samples with very high dilution ratios. Subsequent to sampling, particles were directed to a scanning mobility particle sizer (SMPS) to measure the particle size distribution. The rapid thermocouple insertion method was utilized to measure the flame temperature at different locations. The structure of the nano-particles was investigated by thermophoretic sampling of particles from different heights above the burner and analyzing these samples with a transmission electron microscope (TEM). Using the SMPS scans and TEM images, different stages of nano-particles evolution, from inception to coagulation and oxidation, were observed. Results show that considerable concentrations of NaCl nano-particles emerge at low heights above the burner (8 mm) in the methane flame doped with NaCl particles. The NaCl nano-particles formed at lower heights above the burner disappear as the height above the burner increases. Additionally, by comparing the results obtained in the methane diffusion flame and the flame doped with NaCl, it was found that the addition of NaCl particles leads to the formation of particles with smaller sizes and greater concentrations in regions of the flame were coagulation is the dominant process of particle formation.

  • Subjects / Keywords
  • Graduation date
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
    • Department of Mechanical Engineering
  • Supervisor / co-supervisor and their department(s)
    • Olfert, Jason (Mechanical Engineering)
    • Kostiuk, Larry (Mechanical Engineering)
  • Examining committee members and their departments
    • Kostiuk, Larry (Mechanical Engineering)
    • Olfert, Jason (Mechanical Engineering)
    • Koch, Bob (Mechanical Engineering)