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- W2593476054 abstract "During the rapid laser pulse heating and consecutive cooling in laser-induced incandescence (LII), soot particles may undergo thermal annealing and sublimation processes which lead to a permanent change in its optical properties and its primary particle size, respectively. Overall, effects of these two processes on soot and LII model-based particle sizing are investigated by measuring the two-color time-resolved (2C-TiRe) LII signal decay from in-flame soot after two consecutive laser pulses at 1064-nm wavelength. Experiments are carried out on a non-premixed laminar ethylene/air flame from a Santoro burner with both low and moderate laser fluences suitable for particle sizing. The probe volume is set to a radial position close to the flame axis where the soot particles are known to be immature or less graphitic. With the first pulse, soot is pre-heated, and the LII signal after the consecutive second pulse is used for analysis. The two-color incandescence emission technique is used for the pyrometric determination of the LII-heated peak soot temperature at the second pulse. A new LII simulation tool is developed which accounts for particle heating via absorption and annealing, and cooling via sublimation, conduction, and radiation with various existing sub-models from the literature. The same approach of using two laser pulses is implemented in the simulations. Measurements indicate that thermal annealing and associated absorption enhancement becomes important at laser fluences above 0.17 J/cm2 for the immature in-flame soot. After a heating pulse at 0.33 J/cm2, the increase of the soot absorption function is calculated as 35% using the temperature measured at the second pulse and an absorption model based on the Rayleigh approximation. Present annealing model, on the other hand, predicts graphitization of soot even in the absence of laser heating at typical flame temperatures. Recorded experimental LII signal decays and LII-heated peak soot temperature information are used for particle sizing with the LII modeling to assess the effects of sublimation. A reduction in particle size due to sublimation starts at a laser fluence of 0.1 J/cm2 for the in-flame soot. After a heating pulse at 0.33 J/cm2, the particle loses 55% of its initial mass." @default.
- W2593476054 created "2017-03-16" @default.
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- W2593476054 date "2017-02-27" @default.
- W2593476054 modified "2023-09-23" @default.
- W2593476054 title "Quantitative effects of rapid heating on soot-particle sizing through analysis of two-pulse LII" @default.
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- W2593476054 doi "https://doi.org/10.1007/s00340-017-6653-7" @default.
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