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    Investigating Soot Morphology in Counterflow Flames at Elevated Pressures

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    HafizMuhammadFahidAminThesis.pdf
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    34.84Mb
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    Description:
    Dissertation_Hafiz Amin
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    Type
    Dissertation
    Authors
    Amin, Hafiz cc
    Advisors
    Roberts, William L. cc
    Committee members
    Sarathy, Mani cc
    Knio, Omar cc
    Magnotti, Gaetano cc
    Koylu, Umit O.
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2018-01
    Permanent link to this record
    http://hdl.handle.net/10754/627373
    
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    Abstract
    Practical combustion devices such as gas turbines and diesel engines operate at high pressures to increase their efficiency. Pressure significantly increases the overall soot yield. Morphology of these ultra-fine particles determines their airborne lifetime and their interaction with the human respiratory system. Therefore, investigating soot morphology at high pressure is of practical relevance. In this work, a novel experimental setup has been designed and built to study the soot morphology at elevated pressures. The experimental setup consists of a pressure vessel, which can provide optical access from 10° to 165° for multi-angle light scattering, and a counterflow burner which produces laminar flames at elevated pressures. In the first part of the study, N2-diluted ethylene/air and ethane air counterflow flames are stabilized from 2 to 5 atm. Two-angle light scattering and extinction technique have been used to study the effects of pressure on soot parameters. Path averaged soot volume fraction is found to be very sensitive to pressure and increased significantly from 2 to 5 atm. Primary particle size and aggregate size also increased with pressure. Multi-angle light scattering is also performed and flames are investigated from 3 to 5 atm. Scattering to absorption ratio is calculated from multi-angle light scattering and extinction data. Scattering to absorption ratio increased with pressure whereas the number of primary particles in an aggregate decreased with increasing pressure. In the next part of the study, Thermophoretic Sampling of soot is performed, in counterflow flames from 3 to 10 atm, followed by transmission electron microscopy. Mean primary particle size increased with pressure and these trends are consistent withour light scattering measurements. Fractal properties of soot aggregates are found to be insensitive to pressure. 2D diffused light line of sight attenuation (LOSA) and Laser Induced Incandescence (LII) are used to measure local soot volume fraction from 2 to 10 atm. Local soot volume fraction increased with pressure and soot concentration profiles showed good agreements when measured by both techniques. Experimental data obtained in this work is very helpful for the modelers for validating their codes and predicting the soot formation in pressurized flames.
    Citation
    Amin, H. (2018). Investigating Soot Morphology in Counterflow Flames at Elevated Pressures. KAUST Research Repository. https://doi.org/10.25781/KAUST-EP9VY
    DOI
    10.25781/KAUST-EP9VY
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-EP9VY
    Scopus Count
    Collections
    Dissertations; Dissertations; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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