Scavenging of aerosol particles by large water drops: 1. Neutral case
Scavenging of aerosol particles by large water drops: 1. Neutral case
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DOI：
10.1029/96jd01311
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发表时间：
1996-10
影响因子：
--
通讯作者：
T. S. Pranesha;A. Kamra
中科院分区：
文献类型：
--
作者：
T. S. Pranesha;A. Kamra
进行了毫米级中性水滴收集微米级气溶胶粒子的实验室实验。结果表明，捕集效率随着液滴尺寸的减小和/或颗粒尺寸的增大而增加，这与以往的研究结果一致。此外，还观察到收集效率随撞击参数的增大而增大，随雷诺数的降低而减小。实验中获得的有限而稀疏的数据表明，当颗粒直径接近10μm时，大液滴的收集效率可能会达到一个上限，而这个上限可能小于1，而且这种大液滴所达到的最大收集效率似乎随着液滴尺寸的增加而降低。用形状振荡和大水滴的涡流脱落能力解释了观测结果。
A laboratory experiment to measure the collection efficiency of millimeter-sized neutral water drops collecting micron-sized aerosol particles has been conducted. In agreement with the previous studies, the results show that the collection efficiency increases with the decrease in drop size and/or increase in particle size. Further, the collection efficiency is observed to increase with impaction parameter and decrease with the drop Reynold's number. The limited and sparse data obtained in our experiment suggets that the collection efficiency of large drops may attain an upper limit which may be less than unity as the particle diameter approaches 10 μm. Moreover, the maximum collection efficiency attained by such large drops seems to decrease with the increasing drop size. Shape oscillations and the eddy shedding capability of large water drops have been proposed to explain the observed results.