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    Effects of non-unity Lewis number of gas-phase species in turbulent nonpremixed sooting flames

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    Type
    Article
    Authors
    Attili, Antonio
    Bisetti, Fabrizio cc
    Mueller, Michael E.
    Pitsch, Heinz
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Reactive Flow Modeling Laboratory (RFML)
    Date
    2016-02-13
    Online Publication Date
    2016-02-13
    Print Publication Date
    2016-04
    Permanent link to this record
    http://hdl.handle.net/10754/621740
    
    Metadata
    Show full item record
    Abstract
    Turbulence statistics from two three-dimensional direct numerical simulations of planar n-heptane/air turbulent jets are compared to assess the effect of the gas-phase species diffusion model on flame dynamics and soot formation. The Reynolds number based on the initial jet width and velocity is around 15, 000, corresponding to a Taylor scale Reynolds number in the range 100 ≤ Reλ ≤ 150. In one simulation, multicomponent transport based on a mixture-averaged approach is employed, while in the other the gas-phase species Lewis numbers are set equal to unity. The statistics of temperature and major species obtained with the mixture-averaged formulation are very similar to those in the unity Lewis number case. In both cases, the statistics of temperature are captured with remarkable accuracy by a laminar flamelet model with unity Lewis numbers. On the contrary, a flamelet with a mixture-averaged diffusion model, which corresponds to the model used in the multi-component diffusion three-dimensional DNS, produces significant differences with respect to the DNS results. The total mass of soot precursors decreases by 20-30% with the unity Lewis number approximation, and their distribution is more homogeneous in space and time. Due to the non-linearity of the soot growth rate with respect to the precursors' concentration, the soot mass yield decreases by a factor of two. Being strongly affected by coagulation, soot number density is not altered significantly if the unity Lewis number model is used rather than the mixture-averaged diffusion. The dominant role of turbulent transport over differential diffusion effects is expected to become more pronounced for higher Reynolds numbers. © 2016 The Combustion Institute.
    Citation
    Attili A, Bisetti F, Mueller ME, Pitsch H (2016) Effects of non-unity Lewis number of gas-phase species in turbulent nonpremixed sooting flames. Combustion and Flame 166: 192–202. Available: http://dx.doi.org/10.1016/j.combustflame.2016.01.018.
    Sponsors
    We acknowledge valuable support from KAUST Supercomputing Laboratory (KSL) in the form of assistance with code development and computational time on the IBM System Blue Gene/P "Shaheen" at King Abdullah University of Science and Technology. H.P. acknowledges funding by Forschungsvereinigung Verbrennungsmotoren (FVV) and Deutsche Forschungsgemeinschaft (DFG) within the DFG/FVV project PI 368/6-1.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2016.01.018
    Additional Links
    http://api.elsevier.com/content/search/scidir?query=pii%28S0010218016000316%29&view=STANDARD
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2016.01.018
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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