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首页> 外文会议>Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics Part.II Laser Sensing and Atmospheric Physics; Jun 24-28, 2003; Tomsk, Russia >About variations of the wood smoke microstructure under influence of external factors
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About variations of the wood smoke microstructure under influence of external factors

机译：关于外部因素影响下的木材烟气微观结构变化

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摘要

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℃) 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 0.18 μm), intermediately dispersed particles (0.4 to 0.7 μm) and coarse particles (0.9 to 1.2 μm).Experiments in humidified air show that, if an 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 revealed that, even in the case of a weak (～ 55℃) 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).
机译：我们分析了封闭空间中由于对木材的热效应而形成的气溶胶的光学和微物理特性的变化。结果表明，在木材的低温热解（300-500℃）和针叶树脂的热升华过程中，会形成具有相似分散特性的颗粒。通常，在产生浓密的木烟之后的初始阶段观察到多峰体积大小分布。最大值位于细分散的累积分数（模态半径为0.1至0.18μm），中等分散的颗粒（0.4至0.7μm）和粗颗粒（0.9至1.2μm）的范围内。烟雾混合物（高浓度的气溶胶颗粒和带有气溶胶的物质的蒸气）多次穿越温度不均匀性，然后形成模态半径为0.55和0.9μm的两个准水滴部分。测量表明，即使在针叶树木表面加热不佳（约55℃）的情况下，所实现的气溶胶颗粒和气溶胶物种（封闭体积）的蒸气释放速率也足以形成针叶树。细分散的部分（0.05-0.2μm）。

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