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


Other title
Laminar diffusion flame
Probe sampling
Particle size distribution
Type of item
Degree grantor
University of Alberta
Author or creator
Moallemi, Alireza
Supervisor and department
Olfert, Jason (Mechanical Engineering)
Kostiuk, Larry (Mechanical Engineering)
Examining committee member and department
Kostiuk, Larry (Mechanical Engineering)
Olfert, Jason (Mechanical Engineering)
Koch, Bob (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
2017-06:Spring 2017
Master of Science
Degree level
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.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. 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.
Citation for previous publication
Kazemimanesh, M., Moallemi, A., Olfert, J.S. & Kostiuk, L.W. (2016). Probe sampling to map and characterize nanoparticles along the axis of a laminar methane jet diffusion flame. Proceedings of the Combustion Institute., (in press):doi: 10.1016/j.proci.2016.06.169.

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