Soot Volume Fraction Profiles in Forced-Combusting Boundary Layers
| Autor: | P. J. Pagni, Richard A. Beier |
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| Rok vydání: | 1983 |
| Předmět: | |
| Zdroj: | Journal of Heat Transfer. 105:159-165 |
| ISSN: | 1528-8943 0022-1481 |
| DOI: | 10.1115/1.3245535 |
| Popis: | A multiwavelength laser transmission technique is used to determine soot volume fraction fields and approximate particle size distributions in a forced flow combusting boundary layer. Measurements are made in diffusion flames of polymethylmethacrylate (PMMA) and five liquid hydrocarbon fuels (n-heptane, iso-octane, cyclohexane, cyclohexene, and toluene) with ambient oxygen mass fractions in the range of 0.23< or approx. =Y/sub 0infinity/ < or approx. =0.50. Soot is observed in a region between the pyrolyzing fuel surface and the flame zone. Soot volume fraction increases monotonically with Y/sub 0infinity/ , e.g., n-heptane and PMMA are similar with soot volume fractions, f/sub v/, ranging from f/sub v/ approx.5 x 10/sup -7/ at Y/sub 0infinity/ = 0.23 to f/sub v/ approx.5 x 10/sup -6/ at Y/sub 0infinity/ = 0.50. For an oxygen mass fraction the same as air, Y/sub 0infinity/ = 0.23, soot volume fractions are approximately the same as values previously reported in pool fires and a free combusting boundary layer. However, the shape of the f/sub v/ profile changes with more soot near the flame in forced flow than in free flow due to the different y-velocity fields in these two systems. For all fuels tested, a most probable particle radius is betweenmore » 20 nm and 80 nm, and does not appear to change substantially with location, fuel, or oxygen mass fraction.« less |
| Databáze: | OpenAIRE |
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