エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
ISSN-L : 0912-2834
19 巻 , 1 号
Spring
選択された号の論文の10件中1~10を表示しています
特集「個別組成分析や浮遊状態計測を目指す最新計測分析技術とその応用」
技術論文
  • 山本 勝
    2004 年 19 巻 1 号 p. 41-49
    発行日: 2004/03/20
    公開日: 2007/09/27
    ジャーナル フリー
    A moment method of a q-th order extended log-normal size distribution (ELND) is established for the Brownian aerosol coagulation in a wide range from the free-molecule to the continuum regimes, in order to readily apply the moment method to not only log-normal distribution (LND) but also zeroth-order logarithmic distribution (ZOLD) . We can easily choose LND or ZOLD in the ELND moment method by merely altering q (q =-1 or 0, respectively) . Since the moment method of ZOLD has not been established in a wide coagulation regime, ZOLD was mainly examined by using the ELND moment method. The results of the ELND moment method are similar to those of the volume-conserving sectional method. For total particle number per unit volume and total surface area per unit volume, the differences between the moment and the sectional methods are within 4 % in the cases of initial standard deviations of 1.5 and 1.75. The results are insensitive to the time step size used in numerical time integration (the fourth-order Runge-Kutta method) , when the time step size is shorter than 4800 s. The simple ELND moment method is expected to be widely used, when the observational and experimental results described by LND and ZOLD are examined in large-scale scientific simulations of environmental and climate changes.
研究論文
  • 片山 和彦, 北尾 智, 島田 学, 奥山 喜久夫
    2004 年 19 巻 1 号 p. 50-57
    発行日: 2004/03/20
    公開日: 2007/09/27
    ジャーナル フリー
    Particle size distribution of cigarette side-stream smoke (CSSS) was measured just above the burning tip with a laser light scattering method. 2-D polarization-sensitive laser light scattering (2DPLLS) system was applied to the in situ measurement of CSSS since this method can acquire the spatial distribution of particle mean diameter with ICCD camera. It was found that the particle mean diameter was 0.33 μm with the geometric standard deviation of 1.3, in favorable comparison to the particle mean diameter of 0.24 μm with the geometric standard deviation of 1.1 at 2 mm above the burning tip, which was measured by 1-D multi-angle laser light scattering (1DLLS) method. Furthermore, we measured the entire particle size distribution using a scanning mobility particle sizer (SMPS) and obtained the particle mean diameter of 0.17 μm with the geometric standard deviation of 1.5. The values obtained in the present work were reasonably in good agreement with those reported by other researchers using ex situ methods. Consequently, we concluded that the in situ 2DPLLS method is suitable for the measurement of CSSS.
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