Vol. 16, issue 04, article # 7

Abstract:

We analyze the variations of optical and microphysical properties of aerosol formed due to thermal effect on the wood materials in closed volumes. Experiments show that, if an air mixture (with high concentration of aerosol particles and vapor of aerosol-bearing species) crosses temperature inhomogeneities many times, then two liquid droplet fractions form in the disperse composition of pyrolysis smokes with characteristic sizes r ~ 0.55 and 0.9 mkm in the size interval of medium dispersed fraction (0.4-1.5 mkm). The experiments revealed that, even in the case of a weak (~ 55°С) heating of surface of a coniferous tree wood, the achieved emission, with high concentration of aerosol particles and vapor of aerosol-bearing species (in closed volumes), has a rate quite sufficient for formation of finely dispersed fraction (0.05-0.2 mkm) with optically measurable concentrations.