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    Bidirectional ionic wind in nonpremixed counterflow flames with DC electric fields

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    Type
    Article
    Authors
    Park, Daegeun cc
    Chung, Suk Ho cc
    Cha, Min Suk cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-05-05
    Online Publication Date
    2016-05-05
    Print Publication Date
    2016-06
    Permanent link to this record
    http://hdl.handle.net/10754/622176
    
    Metadata
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    Abstract
    Under an electric field, ions in the reaction zone of a flame generate a bulk flow motion called ionic wind. Because the majority of ions are positive, ionic wind is commonly considered to be unidirectional toward the cathode. A more thorough understanding of the effects of electric fields on flames could be obtained by clarifying the role of minor negative ions in the ionic wind. Here, we report on the effects of direct current on nonpremixed counterflow flames by visualizing the ionic wind. We found that the original flow field separates near the flame when it locates at a flow stagnation plane, resulting in a double-stagnant flow configuration. This evidences a bidirectional ionic wind blowing from the flame to both the cathode and the anode due to the positive and the negative ions, respectively. Meanwhile, an electric body force pulls the flame toward the cathode. Thus, the electric field affects the strain rate and the axial location of the stoichiometry, which are important for characterizing nonpremixed counterflow flames. In addition, measurement of the electric current density roughly showed a nearly saturated current when these flames restabilized under relatively high voltage. Detailed explanations of flame behavior, electric currents, and flow characteristics of various fuels are discussed in this study.
    Citation
    Park DG, Chung SH, Cha MS (2016) Bidirectional ionic wind in nonpremixed counterflow flames with DC electric fields. Combustion and Flame 168: 138–146. Available: http://dx.doi.org/10.1016/j.combustflame.2016.03.025.
    Sponsors
    Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST) under Competitive Research Funding.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2016.03.025
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2016.03.025
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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