23 February 2004 Variations of the wood smoke microstructure under the influence of external factors
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Proceedings Volume 5397, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics; (2004) https://doi.org/10.1117/12.548574
Event: Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2003, Tomsk, Russian Federation
Abstract
We analyze the variations of optical and microphysical properties of aerosol formed due to thermal effect on the wood materials in closed volumes. It is shown that particles with similar peculiarities of the disperse composition are formed at low-temperature pyrolysis of wood (300 to 500°C) and thermal sublimation of coniferous resins. As a rule, polymodal volume size distribution is observed at the initial stage after generation of the dense wood smoke. The maxima are located in the ranges of finely dispersed accumulative fraction (with modal radius of 0.1 to 0l8 μm), intermediately dispersed particles (o9.4 to 0.7μm) and coarse particles (0.9 to 1.2 μm). Experiments in humidified air show that, if a smoke mixture (with high concentration of aerosol particles and vapor of aerosol-bearing species) crosses temperature inhomogeneities many times, then two quasi-water-droplet fractions of the modal radius 0.55 and 0.9 μm are formed. Measurements reavealed that, even in the case of a weak (≈55°C) heating of surface of a coniferous tree wood, the achieved emission of aerosol particles and vapor of aerosol-bearing species (in closed volumes) has a rate sufficient for formation of finely dispersed fraction (0.05-0.2 μm).
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Valerii Stepanovich Kozlov, Valerii Stepanovich Kozlov, R. F. Rakhimov, R. F. Rakhimov, E. V. Makienko, E. V. Makienko, Mikhail V. Panchenko, Mikhail V. Panchenko, V. Shmargunov, V. Shmargunov, } "Variations of the wood smoke microstructure under the influence of external factors", Proc. SPIE 5397, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics, (23 February 2004); doi: 10.1117/12.548574; https://doi.org/10.1117/12.548574
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