エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
ISSN-L : 0912-2834
7 巻 , 3 号
Autumn
選択された号の論文の6件中1~6を表示しています
研究論文
  • 向阪 保雄, 遠藤 禎行, 室谷 義治, 福嶋 信彦
    1992 年 7 巻 3 号 p. 219-229
    発行日: 1992/09/20
    公開日: 2011/06/09
    ジャーナル フリー
    Firstly, a high flow rate (14l/min) mixing type CNC (condensation nucleus counter) has been developed and its performance was evaluated. The counting efficiency of the CNC by use of the condensing vapor of ethylene-glycol and propyrene-glycol was found to be about 60 % and 100 % with 5 nm and 10 nm particles, respectively. Secondly, a new cumulative type electrical mobility analyzer has been developed, where the CNC above developed is combined as a detector of classified aerosol particles and a radio-active source is used as a charger of feed aerosols, and it was found that the analyzer was applicable to size analysis of low concentration (>1.5×107 particles/m3) and small (5 ∼ 100 nm) aerosol particles which followed log-normal size distribution.
  • 松井 浩, 村田 幹生
    1992 年 7 巻 3 号 p. 230-239
    発行日: 1992/09/20
    公開日: 2011/06/09
    ジャーナル フリー
    A sampling line used for collecting aerosol particles for dust monitoring generally consists of vertical, horizontal and bent pipes. To estimate the aerosol deposition onto the sampling line as accurately as possible is required for proper evaluation of aerosol concentration. This paper describes the derivation of the reasonable equation of particle deposition velocities onto the vertical pipe wall, where a free flight model by Friedlander et al. and a turbulent particle diffusivity by Lin et al. were used. In particular, a problem concerned with the starting point of free flight of particles is eliminated, and the introduction of Brownian diffusivity for smaller particles and a correction factor to the assumed lag between fluid and particle motions, in the turbulent core of the flowing fluid, for larger particles makes the deposition velocity equation applicable for the whole range of particle size and fluid Reynolds number.
  • 山田 裕司, 小泉 彰
    1992 年 7 巻 3 号 p. 240-244
    発行日: 1992/09/20
    公開日: 2011/06/09
    ジャーナル フリー
    Measurements of particle number concentration were made in pulse count mode of a condensation nucleus counter (CNC) in order to evaluate particle coincidence error at high concentrations. A screen-type diffusion battery was used to change particle concentration by a constant factor. Existing correction theory was tested against the experimental data. The results showed that two parameters related to the viewing volume of the CNC was very important for the correction. One of them is sampling flow rate, and the other is effective time particles spend m the viewing volume. When the coincidence is appropriately corrected, concentration measurable in pulse count mode of the CNC (TSI model 3760) can be extended to 105 particles/cm3.
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