Soot generation within radiating diffusion flames

  • Pagni P
  • Okoh C
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Abstract

Soot volume fraction data on six fuels [C7H8, C6H10, C8H18, C6H12, C7H16and (C5H8O2)n] in free, radiating, boundary layer, diffusion flames are presented. Approximate particle concentrations and size distributions, determined with previously reported optical techniques, are used. These sizes, r∼30 nm, indicate the particles are in the free molecular flow regime, Kn∼10, so that convective heat transfer dominates other thermal mechanisms and the particle temperature appears locked closely to the local gas temperature. Based on this coupling, soot radiation is incorporated in the boundary layer gas energy equation. The pertinent fields, i.e., temperature, velocity and species, are evaluated. Comparisons are made with corrected experimental temperatures obtained with thermocouples. Thermophoretic forces are included in particle trajectory determinations. The local soot mass flow rates within the boundary layer are found and net soot volume fraction generation rates, fv, are obtained for these well characterized laminar flames. An Arrhenius form appears to suffice to describe the temperature dependence of the soot growth rate over the temperature range, 1700

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Authors

  • P. J. Pagni

  • C. I. Okoh

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