INVESTIGATION OF OPTICAL CHARACTERISTICS AND PARTICLE-SIZE DISTRIBUTION OF WOOD-SMOKE AEROSOLS

The microstructure and optical characteristics of wood-smoke aerosols are studied as a function of the combustion regime, smoke-formation in tensity, ''aging'' with time, artificial change in the relative air hu midity, and particle temperature by the methods of polarization nephel ometry, photoelectric counting, and electron. microscopy. A three-frac tional model of the particle-size distribution is proposed, and the ro le of each fraction in the stages of smoke formation and further chang es is justified. It is shown that the governing factor for the formati on of strongly absorbing particles (black-carbon content) is a combust ion regime. The absorption parameters and the content of volatile comp onents in black-carbon particles are estimated.