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    Investigations of the long-term effects of LII on soot and bath gas

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    Type
    Article
    Authors
    Cenker, Emre cc
    Bennett, A.
    Roberts, William L. cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2017-08-24
    Online Publication Date
    2017-08-24
    Print Publication Date
    2017-12-02
    Permanent link to this record
    http://hdl.handle.net/10754/625425
    
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    Abstract
    A combination of high-repetition rate imaging, laser extinction measurements, two-colour soot pyrometry imaging, and high-resolution transmission electron microscopy of thermophoretically sampled soot is used to investigate the long-term and permanent effects of rapid heating of in-flame soot during laser-induced incandescence (LII). Experiments are carried out on a laminar non-premixed co-annular ethylene/air flame with various laser fluences. The high-repetition rate images clearly show that the heated and the neighbouring laser-border zones undergo a permanent transformation after the laser pulse, and advect vertically with the flow while the permanent marking is preserved. The soot volume fraction at the heated zone reduces due to the sublimation of soot and the subsequent enhanced oxidation. At the laser-border zones, however, optical thickness increases that may be due to thermophoretic forces drawing hot particles towards relatively cooler zones and the rapid compression of the bath gas induced by the pressure waves created by the expansion of the desorbed carbon clusters. Additionally sublimed carbon clusters can condense onto existing particles and contribute to increase of the optical thickness. Time-resolved two-colour pyrometry imaging show that the increased temperature of soot both in the heated and neighbouring laser-border zones persists for several milliseconds. This can be associated to the increase in the bath-gas temperature, and a change in the wavelength-dependent emissivity of soot particles induced by the thermal annealing of soot. Ex-situ analysis show that the lattice structure of the soot sampled at the laser-border zones tend to change and soot becomes more graphitic. This may be attributed to thermal annealing induced by elevated temperature.
    Citation
    Cenker E, Bennett A, Roberts WL (2017) Investigations of the long-term effects of LII on soot and bath gas. Aerosol Science and Technology: 00–00. Available: http://dx.doi.org/10.1080/02786826.2017.1368444.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Informa UK Limited
    Journal
    Aerosol Science and Technology
    DOI
    10.1080/02786826.2017.1368444
    Additional Links
    http://www.tandfonline.com/doi/full/10.1080/02786826.2017.1368444
    Relations
    Is Supplemented By:
    • [Dataset]
      E. Cenker, A. Bennett, & W. L. Roberts. (2017). Investigations of the long-term effects of LII on soot and bath gas [Data set]. Taylor & Francis. https://doi.org/10.6084/M9.FIGSHARE.5341276.V1. DOI: 10.6084/m9.figshare.5341276.v1 Handle: 10754/663814
    ae974a485f413a2113503eed53cd6c53
    10.1080/02786826.2017.1368444
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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