CONDENSATIONAL GROWTH OF ULTRAFINE AEROSOL-PARTICLES IN A NEW PARTICLE-SIZE MAGNIFIER
CONDENSATIONAL GROWTH OF ULTRAFINE AEROSOL-PARTICLES IN A NEW PARTICLE-SIZE MAGNIFIER
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DOI：
10.1080/02786828408959024
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发表时间：
1984-01-01
影响因子：
5.2
通讯作者：
MOTOUCHI, T
中科院分区：
文献类型：
--
作者：
OKUYAMA, K;KOUSAKA, Y;MOTOUCHI, T
研制了一种新型的粒度放大器（PSM）。为了评估PSM的性能，超细气溶胶颗粒在过饱和邻苯二甲酸二丁酯蒸汽-空气混合物中的冷凝生长进行了理论和实验研究。首先，过饱和比，可冷凝的DBP蒸汽含量，和将在PSM中生长的颗粒的临界尺寸计算为包含DBP蒸汽的热空气与常温无蒸汽空气的混合。然后，通过数值求解基本方程，在各种条件下的冷凝生长过程中的液滴半径的时间依赖性进行评估。从结果中发现，在较高的颗粒数浓度，最终的液滴半径可以由颗粒数浓度和可冷凝的DBP蒸汽含量，但在较低的浓度下，颗粒的生长可以近似由孤立的液滴的生长。最后，通过沉降粒度分析和电粒度分析确定了PSM中生长的DBP液滴的粒度分布。实验结果与理论分析吻合较好，揭示了PSM的整体性能。
A new particle size magnifier (PSM) has been manufactured. In order to evaluate the performance of the PSM, the condensational growth of ultrafine aerosol particles in a supersaturated dibutyl phthalate vapor-air mixture is investigated theoretically and experimentally. First, the supersaturation ratio, the condensable DBP vapor content, and the critical size of the particle that will grow in the PSM are calculated for the mixing of hot air containing the DBP vapor with normal-temperature vapor-free air. Then the time dependence of the droplet radius during condensational growth is evaluated by numerically solving the basic equation under various conditions. From the results it is found that at higher particle number concentrations, the final droplet radii can be determined by the particle number concentration and the condensable DBP vapor content, but that at lower concentrations the particle growth can be approximated by the growth of the isolated droplet. Finally, size distributions of grown DBP droplets in the PSM are determined by sedimentational size analysis and electrical particle size analysis. Good agreement is seen between the experimental results and the previous theoretical analyses, and the overall performance of the PSM is revealed.