Laser-induced incandescence for soot-particle sizing at elevated pressure |
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Authors: | M Hofmann BF Kock T Dreier H Jander C Schulz |
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Institution: | 1. IVG, Universit?t Duisburg–Essen, Lotharstra?e 1, 47057, Duisburg, Germany 2. IPC, Universit?t G?ttingen, G?ttingen, Germany 3. CeNIDE, Center for Nanointegration Duisburg–Essen, Duisburg, Germany
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Abstract: | This paper describes the applicability of laser-induced incandescence (LII) as a measurement technique for primary soot particle
sizes at elevated pressure. A high-pressure burner was constructed that provides stable, laminar, sooting, premixed ethylene/air
flames at 1–10 bar. An LII model was set up that includes different heat-conduction sub-models and used an accommodation coefficient
of 0.25 for all pressures studied. Based on this model experimental time-resolved LII signals recorded at different positions
in the flame were evaluated with respect to the mean particle diameter of a log-normal particle-size distribution. The resulting
primary particle sizes were compared to results from TEM images of soot samples that were collected thermophoretically from
the high-pressure flame. The LII results are in good agreement with the mean primary particle sizes of a log-normal particle-size
distribution obtained from the TEM-data for all pressures, if the LII signals are evaluated with the heat-conduction model
of Fuchs combined with an aggregate sub-model that describes the reduced heat conduction of aggregated primary soot particles.
The model, called LIISim, is available online via a web interface.
PACS 65.80.+n; 78.20.Nv; 42.62.-b; 47.70.Pq |
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